user-1: I have been practicing mindfulness and watching thoughts.   I usually feel rapture, calm and desireless all the day but not in afternoon after lunch.  In afternoon, I even forget all stability including mindfulness & various desires creeps in the mind. Situations become extraordinarily better after 4-4:30PM. 
Is there any particular reason of afternoon (2-4) instability? What can I do to let that not happen? 

user13709: Restless drowsiness is common after eating. AN7.61 discusses remedies at length, including:

But if by doing this you don’t shake off your drowsiness, then—percipient of what lies in front & behind—set a distance to meditate walking back & forth, your senses inwardly immersed, your mind not straying outwards. It’s possible that by doing this you will shake off your drowsiness.


-1: <p>I have been practicing mindfulness and watching thoughts.   I usually feel rapture, calm and desireless all the day but not in afternoon after lunch.  In afternoon, I even forget all stability including mindfulness &amp; various desires creeps in the mind. Situations become extraordinarily better after 4-4:30PM. </p>

<p>Is there any particular reason of afternoon (2-4) instability? What can I do to let that not happen? </p>
 13709: <p>Restless drowsiness is common after eating. <a href="https://suttacentral.net/an7.61/en/thanissaro" rel="nofollow noreferrer">AN7.61</a> discusses remedies at length, including:</p>

<blockquote>
  <p>But if by doing this you don’t shake off your drowsiness, then—percipient of what lies in front &amp; behind—set a distance to meditate walking back &amp; forth, your senses inwardly immersed, your mind not straying outwards. It’s possible that by doing this you will shake off your drowsiness.</p>
</blockquote>
