But unlike adults, who usually have long periods of REM sleep, babies only stay in this stage for about 5-10 minutes at a time. REM is the stage of sleep when dreams occur and babies are most likely to laugh in their sleep.ĭuring REM sleep, a baby’s brain activity is similar to an adult’s. REM (Rapid Eye Movement) SleepĪfter cycling through the different stages of REM sleep, a baby will enter REM sleep. NREM sleep makes up 75% of a baby’s sleep time. In this stage, babies may start to make soft grunting or moaning noises. It’s not until the third stage of NREM sleep that a baby is in a deep sleep and more challenging to wake up. The second stage of NREM sleep is a little deeper sleep, but a baby can still be aroused relatively easily. During this stage, a baby is easily awakened and may even open their eyes for brief periods. NREM sleep has several stages, but the first stage is considered light sleep. This means that, throughout the night, a baby will cycle through different stages of sleep: NREM (Non-Rapid Eye Movement) Sleep Most babies will sleep for only 2-3 hours at a time before they need to eat again. Newborns also sleep a lot - up to 17 hours a day - but they can’t yet stay asleep for long periods. You may have noticed your baby’s eyes fluttering or arms and legs twitching during these active periods. During the first few months of life, babies sleep in short cycles that alternate between active and quiet periods. Babies and Sleep Cyclesīabies sleep differently than adults. But first, let’s back up and explore what happens when babies sleep. In this article, we’ll explore why babies laugh in their sleep and whether or not it’s something you should be concerned about. But have you ever wondered why babies laugh in their sleep? Whether your little one does it infrequently or on a nightly basis, there’s a scientific explanation for why babies laugh in their sleep.
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