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My son just turned 3 months old last week, and has outgrown his bassinet. I've read online that it is safe for infants to sleep in a pack and play, as long as we are room sharing (which we are).

But I've noticed that ever since moving him from the bassinet to the pack and play, he's been sleeping much more deeply than usual. Normally at night, he would rotate his body in his bassinet, and wind up with his head and feet up against the short ends of the bassinet - which is why we moved him to the bigger pack and play. He would also wake up in the middle of the night for a feeding and changing, and then again in the early morning for another.

Now though, he's had one night where, other than shifting around a bit, he hasn't woken up at all. He will occasionally shift his body, sometimes quite forcefully, but falls right back to sleep afterwards. And last night, he only woke up once for a feeding, again only waking up otherwise to move his body - usually by lifting his legs into the air and then kicking them down into the pack and play mattress.

In addition, when I lifted him out of the pack and play this morning to being our daily routine, he was deep asleep, still moving but so soundly asleep that he didn't even wake up during his diaper change, and only truly woke a few minutes after as I was getting him positioned for a feeding.

I know this might seem strange to worry about - many new parents I'm sure would just be happy to know their child is starting to sleep through the night. But, is the sudden shift of significantly deeper sleep a cause for concern? Or is my infant son simply experiencing the normal transition into longer night sleeping?

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    Sounds like either he is much more comfortable in the new bed, or he has entered a phase where he is just sleeping better. Don't worry - it could all change again in another month :-)
    – Rory Alsop
    Dec 7, 2021 at 20:07
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    Read about the establishment of a circadian rhythm in a baby. This is about when it happens.
    – anongoodnurse
    Dec 8, 2021 at 2:33
  • @anongoodnurse I haven't really found any articles that describe the process in much detail - if you have one, and it matches what my son is going through, that would pretty neatly answer my question here.
    – Zibbobz
    Dec 8, 2021 at 14:06

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+100

Your description of how long it took for your son to wake up, given that it was a noticable change from before when he was sleeping in a bassinet, may be significant.

In heating our homes, forced air and baseboard heat are very common, and they don't heat a room evenly, the floor is the coolest part of the room and the ceiling the warmest.

You don't mention the level of the mattress for the bassinet and the pack-n-play, but typically the pack-n-play will have a mattress level that's a few inches above the floor, and a bassinet will have a mattress level that's higher, about 2.5 to 3 feet above the floor.

If there's a big difference between the bassinet and the pack-n-play mattress levels, I would suggest checking the temperature at both. It may be that the difference in temperature is significant, with the pack-n-play being cooler, and this may be affecting your son.

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    You're absolutely right - I've noticed that when I sit down next to the pack n play with my son, it feels cooler than it does in our bed. I think this discrepancy in heat distribution is exactly what's causing him to have discrepancies in sleeping patterns. He's since gotten used to it (He's now 8 months old) but this is still very valuable information and almost certainly the reason for a change in comfort level. Thank you.
    – Zibbobz
    May 10 at 14:24

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