Summer Sleep Guide: Why Your Baby Stops Sleeping in June (and What to Do)

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June Is Beautiful. But It Can Wreck Your Baby's Sleep.

Longer days. Later sunsets. Warmer nights. June is a month of stretch — light lingers past 8:30 PM, and children who slept beautifully through April and May suddenly start waking at 5 AM.

If this sounds familiar, you're not imagining it. There is genuine sleep science behind the June slump.

3 Things June Does to Sleep

1. Later Sunset = Later Melatonin Onset

Melatonin — the sleep hormone — is triggered by darkness. In June, sunset in most of North America pushes past 8:00 PM. That means melatonin release can be delayed by up to 90 minutes. Your baby isn't fighting bedtime. Their brain literally hasn't gotten the signal that it's night.

2. Higher Room Temperature = More Night Wakings

Babies sleep best in cool environments (18-21°C / 65-70°F). When room temperature creeps above 22°C, night wakings increase significantly. Babies can't regulate their temperature as efficiently as adults, and synthetic bedding traps heat against their skin.

3. Schedule Drift

Summer brings irregularity — trips to the cottage, visits from grandparents, later dinners. All of this disrupts the circadian rhythm that took months to build.

7 Science-Backed Fixes

  1. Blackout curtains. Before the nap and bedtime window, block out all light. Even small light leaks through the crack under a door can suppress melatonin.
  2. Keep the room cool. 18-21°C is ideal. If you don't have AC, a fan (not pointed directly at baby) helps.
  3. Natural bedding. This matters more in summer than winter. Silk and organic cotton breathe. Polyester traps heat. A switch to natural fibers can drop a baby's skin temperature by 1-2°C.
  4. Consistent routine. Even if bedtime shifts 30 minutes later, keep the sequence the same: bath → book → bed.
  5. Morning light exposure. Get sunlight in their eyes (safely) within 30 minutes of waking. This helps anchor the circadian clock.
  6. Watch the humidity. High humidity makes sleep difficult. A dehumidifier in the nursery can make a surprising difference.
  7. Dress for warmth, not heat. One more layer than you'd wear is the rule — but in summer, that might mean just a diaper + silk sleep sack.

The Long Days Won't Last Forever

Summer sleep disruptions are real but temporary. By late July, the days start shortening again, and most babies naturally settle back into their rhythm. Until then, focus on what you can control: the environment, the routine, and the materials your baby sleeps in.

We make the bedding that helps — natural, breathable, dermatologist-tested. But more than that, we're here to help you understand the why behind your baby's sleep.

You've got this. And summer's got nothing on a prepared parent.

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