![]() ![]() your breathing becomes faster and even irregular at times.your heart rate increases to near its wakeful state.you experience dreaming as your brain activity increases to a more wakeful state.your eyes move rapidly from side to side.Stage 5, or your first stage of REM sleep, occurs about 90 minutes after moving through non-REM stages. It lasts for longer periods in the first half of the night and becomes shorter with each sleep cycle. The first stage of deep sleep lasts anywhere from 45 to 90 minutes. it’s difficult to awaken even with loud noisesĭeep sleep is also referred to as “ slow wave sleep” (SWS) or delta sleep.your brain waves become the slowest they’ll be while you’re asleep.your heartbeat and breathing become their slowest as your muscles relax.Stages 3 and 4 are when you experience deep sleep. ![]()
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