An 8-month-old should sleep 12 to 16 hours in a 24-hour period, including 9 to 12 hours at night and 2.5 to 3.5 hours spread across two daytime naps. That’s a wide range, and where your baby falls within it depends on their temperament, how well they nap, and whether they’re in the middle of a developmental leap.
Nighttime Sleep at 8 Months
Most 8-month-olds are capable of sleeping 9 to 12 hours at night. Many babies this age can sleep a long stretch of 6 to 8 hours without waking, a skill that typically emerges around 3 months and becomes more consistent over time. That said, “sleeping through the night” doesn’t always mean 12 uninterrupted hours. Your baby may briefly wake, resettle on their own, and go back to sleep without you knowing.
Night feedings are still common at this age, especially for breastfed babies. Formula-fed babies over 6 months are unlikely to wake from genuine hunger, since formula digests more slowly. Breastfed babies, however, may still need one or two feeds overnight, and reducing those feeds before 12 months can lower your milk supply. If your baby wakes but isn’t hungry, they may just need a moment to settle back down on their own.
How Naps Should Look
By 8 months, most babies have consolidated down to two naps a day. Together, those naps should total about 2.5 to 3.5 hours, and no single nap should run longer than 2 hours. Letting one nap stretch too long can push bedtime later or make the second nap a battle.
A typical pattern looks like a morning nap about 2.5 to 3 hours after waking up, then an afternoon nap with a similar gap. Some babies take two evenly split naps of about 1 to 1.5 hours each, while others take one longer nap and one shorter one. Both patterns are normal as long as total daytime sleep stays in that 2.5 to 3.5 hour range and your baby isn’t fighting bedtime.
Wake Windows Between Sleep
At 8 months, your baby can comfortably handle about 2 to 3 hours of awake time between sleep periods. These gaps tend to get slightly longer as the day goes on. The first wake window of the day (from morning wakeup to the first nap) is usually the shortest, while the stretch before bedtime is typically the longest.
Keeping wake windows consistent helps your baby build up enough sleep pressure to fall asleep without a fight, but not so much that they tip into overtiredness. If your baby is consistently taking 20 minutes or more to fall asleep, their wake window may be too short. If they’re melting down before nap time, it’s probably too long.
Spotting an Overtired Baby
An overtired 8-month-old is harder to get to sleep, not easier. When babies stay awake too long, their bodies release stress hormones like cortisol and adrenaline, which create a wired, hyperactive state instead of a drowsy one. This is why some parents notice their baby seems more energetic right when they should be exhausted.
The trick is catching sleepy cues before your baby crosses into overtired territory. Early signs include yawning, rubbing their eyes, pulling on their ears, staring into the distance, and turning away from toys, sounds, or lights. Some babies do a low, drawn-out whine that never quite becomes a full cry. If you’re seeing clenched fists, back arching, frantic crying, or unusual sweating, you’ve likely missed the window and your baby is already overtired. At that point, getting them to sleep will take more effort, but a calm, dark environment and gentle soothing can help bring those stress hormones back down.
The 8-Month Sleep Regression
If your baby was sleeping well and suddenly isn’t, you’re likely dealing with a sleep regression. Around 8 months, several developmental changes collide at once. Babies this age are learning to crawl, pull up, and sit independently, and their brains often want to practice these skills at the worst possible time, like 2 a.m. in the crib.
Separation anxiety also peaks around this age. Your baby now understands that you still exist when you leave the room, which makes being alone in the dark feel more distressing than it used to. Teething adds another layer, since many babies are cutting teeth around 8 months, and the discomfort is often worse at night when there are fewer distractions. Greater awareness of their surroundings can also make it harder for babies to “turn off” and settle down.
The regression is temporary, though the exact length varies from baby to baby. Some families see disrupted sleep for a week or two, while others deal with it for closer to a month. The most helpful thing you can do is stay consistent with your existing sleep routines. Introducing new sleep crutches during a regression (like rocking to sleep when your baby was previously falling asleep independently) can create habits that outlast the regression itself.
What a Typical Day Looks Like
Putting it all together, a realistic 8-month-old schedule might look something like this:
- 6:30 to 7:00 a.m.: Wake up for the day
- 9:00 to 10:30 a.m.: First nap (about 1 to 1.5 hours)
- 1:00 to 2:30 p.m.: Second nap (about 1 to 1.5 hours)
- 6:30 to 7:30 p.m.: Bedtime
This is a framework, not a rigid schedule. Some babies wake earlier, some nap longer, and bedtime shifts depending on how the day’s naps went. If the second nap was short or skipped, moving bedtime earlier by 30 minutes can prevent overtiredness from snowballing into a rough night. The total sleep goal of 12 to 16 hours is what matters most, not hitting exact clock times.