<s>[INST] My son is 32 months (turns 3 in November) and he has always been a great sleeper, usually going down for nap and bedtime with little to no fuss and falls asleep fairly quick. All of a sudden this past week he has been crying after we put him down and has stayed up fussing/whining/crying for 2-3 hours before finally falling asleep. He has also been staying awake during nap time (on some days). I really do not know what might have sparked this sudden change and would like to know if I should be concerned and/or advice on how to handle. My husband and I are trying to refrain from going into his room (although we have once or twice) - he is still sleeping in his crib at this point, we have not seen the need for transitioning to toddler bed just yet. [/INST] Sleep wake cycle changes all the time in babies. You dont need to worry... He may be having bad dreams or feel anxious when finds no one while he wakes up... Just be there and give him comfort. </s>