user-1: I have set the amount of time I meditate (focused attention/shamatha) at merely 15 minutes per day. Despite this, despite all my best efforts, I seem to still skip a day or two now and then. 
Why is this? Would changing the type of meditation help?
I had read positive emotions help develop a habit. When I meditate mindfully on the breath, there are no such emotions; doing compassion meditation, positive affect arises. Would this affective benefit motivate a meditative practice? 

user-1: There can be several reasons. 
If you are only training concentration ie; tranquilizing the breath or observing thoughts, feelings and perceptions arising and ceasing, then it is possible that you would incline to laziness because you are not cultivating perceptions which would lead to aroused effort and willingness.

If the monk intent on heightened mind were to attend solely to the theme of concentration, it is possible that his mind would tend to laziness.
  http://www.buddha-vacana.org/sutta/anguttara/03/an03-103.html
Bhikkhus, to the bhikkhu practicing the perception of unpleasantness in impermanence and abiding much in it, a keen perception of fear, for laziness, distraction, negligence and non-reflection gets established, like to a slayer with raised sword.http://obo.genaud.net/dhamma-vinaya/mnl/an/07_sevens/an07.046.upal.mnl.htm

You can try doing 15 minutes but cover more bases. 
Perhaps experiment with something like this;

5 minutes - Inconstancy, Unpleasantness, Unattractiveness of Worlds
or Death Contemplation
5 minutes - Uplifted Energy, Appreciation, Sympathetic Joy, Metta, Equanimity or Recollection; of The Buddha, The Dhamma, The Sangha, your own virtue or Devas
5 minutes - Develop Concentration; if restless tranquilize breath
   formation and if sluggish train mindfulness observing feelings,
   thoughts and perceptions as they arise, persist and cease


user15100: Having spend a mindful day with dana, a day having begone with refuge, spend with Sila, one is able to rejoice:
Buddhanussati, 2 min remembering the Buddha
Dhammanussati, 2 min remembering the Dhamma
Sanghanusati...
Remember ones Generosity
Remember ones Virtue
Remember/reflect ones virturs equal the Devas
Having given causes, one gains concentration. Not having given causes, trying to concentrate by effort will always be just developing wrong concentration.
Useless to invest in a roof when foundation is not given.
Duties first: this is not a path for lazyness's fruits. Not the path of demanding and claims.

user12022: Observe the breath carefully - in/out - rising/falling - long/short breaths
train in the breath this way, until mindfulness is achieved. Practice:
mindfulness of the body (kaya);
mindfulness of feelings or sensations (vedanā);
mindfulness of mind or consciousness (citta); and.
mindfulness of dhammās.
As a result one should develop clarity of mind, alertness, clear thinking as a result. As the saying goes: "Cooler heads prevail" - we should develop a cooler head.
If you can't feel yourself breathing via body, sensations, mind, dhammas, then we come back to the mindfulness, regulating mindfulness to follow the breath in these four bases. Just feeling the in/out breath with body alone should be sufficient to feel the cooling effect. This is not insignificant, stay with it.
Study the suttas - Ānāpānasati - Satipaṭṭhāna 
Check your practice against these texts - it should work.
Download Insight Timer for your smart phone
Load the Presets with 15 minute, 20 minute, etc. sessions
Use the unguided meditation method
track your daily, weekly, monthly progress, aiming for stability and getting established.
Or get an actual timer and a meditation bell. It's good to have a zafu. All the props do actually help. Go to sangha meetings. Over time, increase your daily sessions, the more you give, the more you get.

-1: <p>I have set the amount of time I meditate (focused attention/shamatha) at merely 15 minutes per day. Despite this, despite all my best efforts, I seem to still skip a day or two now and then. </p>

<p><strong>Why is this? Would changing the type of meditation help?</strong></p>

<p>I had read positive emotions help develop a habit. When I meditate mindfully on the breath, there are no such emotions; doing compassion meditation, positive affect arises. <strong>Would this affective benefit motivate a meditative practice?</strong> </p>
 -1: <p>There can be several reasons. </p>

<p>If you are only training concentration ie; tranquilizing the breath or observing thoughts, feelings and perceptions arising and ceasing, then it is possible that you would incline to laziness because you are not cultivating perceptions which would lead to aroused effort and willingness.</p>

<blockquote>
  <p>If the monk intent on heightened mind were to attend solely to the theme of concentration, it is possible that his mind would tend to laziness.
  <a href="http://www.buddha-vacana.org/sutta/anguttara/03/an03-103.html" rel="nofollow noreferrer">http://www.buddha-vacana.org/sutta/anguttara/03/an03-103.html</a></p>
  
  <p>Bhikkhus, to the bhikkhu practicing the perception of unpleasantness in impermanence and abiding much in it, a keen perception of fear, for laziness, distraction, negligence and non-reflection gets established, like to a slayer with raised sword.<a href="http://obo.genaud.net/dhamma-vinaya/mnl/an/07_sevens/an07.046.upal.mnl.htm" rel="nofollow noreferrer">http://obo.genaud.net/dhamma-vinaya/mnl/an/07_sevens/an07.046.upal.mnl.htm</a></p>
</blockquote>

<p>You can try doing 15 minutes but cover more bases. </p>

<p>Perhaps experiment with something like this;</p>

<ul>
<li><p>5 minutes - Inconstancy, Unpleasantness, Unattractiveness of Worlds
or Death Contemplation</p></li>
<li><p>5 minutes - Uplifted Energy, Appreciation, Sympathetic Joy, Metta, Equanimity or Recollection; of The Buddha, The Dhamma, The Sangha, your own virtue or Devas</p></li>
<li><p>5 minutes - Develop Concentration; if restless tranquilize breath
   formation and if sluggish train mindfulness observing feelings,
   thoughts and perceptions as they arise, persist and cease</p></li>
</ul>
 15100: <p>Having spend a mindful day with dana, a day having begone with refuge, spend with Sila, one is able to rejoice:</p>

<p>Buddhanussati, 2 min remembering the Buddha
Dhammanussati, 2 min remembering the Dhamma
Sanghanusati...</p>

<p>Remember ones Generosity
Remember ones Virtue
Remember/reflect ones virturs equal the Devas</p>

<p>Having given causes, one gains concentration. Not having given causes, trying to concentrate by effort will always be just developing wrong concentration.</p>

<p>Useless to invest in a roof when foundation is not given.</p>

<p>Duties first: this is not a path for lazyness's fruits. Not the path of demanding and claims.</p>
 12022: <p>Observe the breath carefully - in/out - rising/falling - long/short breaths
train in the breath this way, until mindfulness is achieved. Practice:
mindfulness of the body (kaya);
mindfulness of feelings or sensations (vedanā);
mindfulness of mind or consciousness (citta); and.
mindfulness of dhammās.
As a result one should develop clarity of mind, alertness, clear thinking as a result. As the saying goes: "Cooler heads prevail" - we should develop a cooler head.</p>

<p>If you can't feel yourself breathing via body, sensations, mind, dhammas, then we come back to the mindfulness, regulating mindfulness to follow the breath in these four bases. Just feeling the in/out breath with body alone should be sufficient to feel the cooling effect. This is not insignificant, stay with it.</p>

<p>Study the suttas - Ānāpānasati - Satipaṭṭhāna </p>

<p>Check your practice against these texts - it should work.</p>

<p>Download Insight Timer for your smart phone
Load the Presets with 15 minute, 20 minute, etc. sessions
Use the unguided meditation method
track your daily, weekly, monthly progress, aiming for stability and getting established.</p>

<p>Or get an actual timer and a meditation bell. It's good to have a zafu. All the props do actually help. Go to sangha meetings. Over time, increase your daily sessions, the more you give, the more you get.</p>
