Stage 1 Sleep: This is the lightest stage of NREM sleep, often defined by the presence of slow eye movements. This stage serves as a transition between wakefulness and deeper stages of sleep.
Stage 2 Sleep: The second stage of NREM where our heart rate slows and body temperature drops. Brain waves become slower with only occasional bursts of rapid waves called sleep spindles.
Slow-Wave Sleep (SWS): Also known as deep or delta sleep, this is the third stage in the cycle where brain activity slows down significantly. It's during this time that our bodies repair muscles and tissues, stimulate growth and development, boost immune function, and build energy for the next day.