I wouldn’t attempt to work out whether a baby needs to sleep from how long they’ve been awake. A baby’s sleep needs actually vary a lot from day to day. I have always just fed my son to sleep whenever he was yawning or rubbing his eyes. When he was a newborn he would get anywhere from 8 to 16 hours sleep over a 24 hour period and his wake windows could be anything from 30 minutes to 12 hours. He tends to sleep a lot during developmental leaps, then at the end of the leap he’ll hit a bunch of milestones and go back to his usual pattern of going the whole day on a couple of power naps.
How long a child has been awake is not at all the only factor in figuring out whether they are sleepy, but at least with my three kids I have still found it very helpful to consider. If they are rubbing their eyes after 45 minutes awake, it’s very unlikely that they would go down if I tried, while if it is been 4 hours, it is much more likely. My kids also have done a decent amount of eye rubbing that isn’t related to being sleepy.
I wouldn’t attempt to work out whether a baby needs to sleep from how long they’ve been awake. A baby’s sleep needs actually vary a lot from day to day. I have always just fed my son to sleep whenever he was yawning or rubbing his eyes. When he was a newborn he would get anywhere from 8 to 16 hours sleep over a 24 hour period and his wake windows could be anything from 30 minutes to 12 hours. He tends to sleep a lot during developmental leaps, then at the end of the leap he’ll hit a bunch of milestones and go back to his usual pattern of going the whole day on a couple of power naps.
I’ve never used a Snoo myself but here is an occupational therapist’s view of the Snoo https://www.otdude.com/editorial-opinion/an-occupational-therapists-honest-opinion-on-the-snoo-bassinet-with-some-research/.
How long a child has been awake is not at all the only factor in figuring out whether they are sleepy, but at least with my three kids I have still found it very helpful to consider. If they are rubbing their eyes after 45 minutes awake, it’s very unlikely that they would go down if I tried, while if it is been 4 hours, it is much more likely. My kids also have done a decent amount of eye rubbing that isn’t related to being sleepy.