Le Laboratoire du Sommeil

Why Does My Toddler Wake Up Sweaty in a Sleep Sack?

Many toddlers wake up sweaty even in comfortable sleep environments. Here's what may be causing it and what helped us.

Baby Sleep Temperature Guide for Summer (2026)

Not sure what your baby should wear to sleep tonight? This summer sleep temperature guide helps parents choose the right layers and TOG rating for comfortable sleep.

How Sleep Sack Fabric Affects Baby Sleep

Some sleep sacks feel cool at bedtime but trap heat overnight. Here's what parents should look for when choosing a cooler sleep sack.

Which Sleep Sack Stays Coolest Overnight?

Not all sleep sacks feel the same overnight. Here's what many parents notice when comparing popular bamboo sleep sacks for hot sleepers.

Why Does My Baby Sweat in Little Sleepies?

Some babies sleep comfortably in Little Sleepies while others wake up sweaty. Here's why overheating can happen and what parents often learn when comparing bamboo sleepwear.