Most 6-month-olds do best with a bedtime between 7:00 and 8:00 PM, though the ideal time for your baby depends on when their last nap ended and how long they can comfortably stay awake. A bedtime as late as 9:00 PM can still work, but pushing much past that usually leads to overtiredness, which makes falling asleep harder, not easier.
Why 7 to 8 PM Works for Most Babies
By 6 months, your baby’s internal clock has matured significantly. Their natural sleep hormone production follows a more predictable pattern now, with levels rising in the evening and creating a window where falling asleep comes more easily. This biological shift is why most 6-month-olds naturally start showing sleepy cues in the early evening hours.
At this age, babies need 12 to 16 total hours of sleep in a 24-hour period, including naps. Most get about 10 to 12 of those hours at night, with the rest split across daytime naps. A 7:00 to 8:00 PM bedtime gives enough room for a full night of sleep plus a reasonable morning wake time between 6:00 and 7:00 AM.
The Last Wake Window Matters Most
The clock on the wall matters less than the gap between your baby’s last nap and bedtime. This final stretch of awake time, often called the last wake window, is the single biggest factor in whether bedtime goes smoothly or turns into a battle.
At 6 months, most babies handle a last wake window of about 2.5 to 3.5 hours. Babies who have transitioned to two naps often need a longer stretch of 3.5 to 4 hours before bed. So if your baby’s last nap ends at 4:00 PM, a bedtime around 7:00 to 7:30 PM hits the sweet spot. If that nap ends at 3:00 PM, you might need to aim for 6:30 or 7:00 PM instead.
A helpful guideline: try to avoid naps that start after 3:30 PM, since late naps can push bedtime too far into the evening and throw off the whole night.
How the 3-to-2 Nap Transition Changes Bedtime
Six months is right in the middle of a major nap transition. Many babies this age are shifting from three naps down to two, and this transition can temporarily scramble your bedtime routine. Some days your baby will take three naps and do fine with a 7:30 PM bedtime. Other days they’ll skip that third nap entirely, leaving a longer gap before bed.
On days when the third nap doesn’t happen, move bedtime earlier. Even 30 to 45 minutes can make a real difference. A baby who normally sleeps at 7:30 might need a 6:45 bedtime on a two-nap day to avoid becoming overtired. This flexibility is temporary. Once your baby fully settles into a two-nap schedule, usually around 7 months, bedtime becomes more consistent again.
Some 6-month-olds drop to two naps earlier than expected. If your baby seems to be doing this and you’re noticing more night wakings or very early mornings, overtiredness from too-long wake windows could be the cause. In that case, an earlier bedtime can help more than trying to force a third nap.
Signs You’ve Missed the Window
Babies who stay up too long don’t just get sleepier. They get a surge of stress hormones that actually wires them up, making it harder to fall asleep and stay asleep. This is the frustrating paradox of infant sleep: an overtired baby fights sleep more than a well-rested one.
Early sleepy cues are your signal to start the bedtime routine. These include staring off into space, rubbing eyes or ears, yawning, and turning away from stimulation. If you miss those and see frantic crying, sweating, or sudden meltdowns that seem to come out of nowhere, your baby has likely crossed into overtiredness. The stress hormones behind that sweating and crying can take time to clear, which is why an overtired baby may take 30 minutes or more to finally settle down.
What Can Disrupt a Good Bedtime
Even with perfect timing, 6-month-olds go through a period of sleep disruption driven by developmental changes. Your baby is likely learning to sit up, possibly starting to scoot or crawl, and their brain is busy processing these new physical skills even during sleep. You might notice them practicing sitting in their crib instead of settling down.
Around this same age, babies also begin to understand that people and objects still exist when they can’t see them. This cognitive leap, known as object permanence, means your baby now realizes you’re somewhere else when you leave the room. That awareness can trigger new separation anxiety at bedtime, even if your baby previously went down without fuss. These disruptions are normal and temporary, and they don’t mean your bedtime is wrong. Keeping the timing consistent helps your baby resettle into their routine faster once the developmental burst passes.
Finding Your Baby’s Ideal Bedtime
Start with 7:00 PM as a baseline, then adjust based on what you observe. Track when your baby’s last nap ends each day and count forward 2.5 to 3.5 hours. That landing point is your target bedtime for that specific day. If your baby falls asleep within 15 to 20 minutes of being put down and sleeps through most of the night (one or two feeds is still normal at this age), you’ve found the right window.
If your baby consistently takes a long time to fall asleep, bedtime might be too early. If they’re melting down during the bedtime routine, it’s probably too late. Small shifts of 15 to 30 minutes in either direction are usually enough to find the right balance. Consistency matters more than precision. A baby who goes to bed at roughly the same time each night, give or take 30 minutes, will develop stronger sleep patterns than one whose bedtime swings by two hours depending on the day.