Stages of sleep cycle
There are five basic sleep stages in the sleep cycle.
Stage I: The alpha waves diminish while the theta waves activity increases. This is a non-REM sleep stage. During this transition stage, brain activities slow down and it becomes slower and irregular
Stage II: People drift further into sleep and breathing becomes more shallow and irregular. K-complexes occur during this stage. Less than 50% of sleep time is spent in this stage.
Stage III: In this stage there is a transition towards the next stage before. There is slow wave sleep made up of 20-50% delta waves.
Stage IV: I It occurs around midnight. People spend about 30-minute in this stage the first time
Stage V: In this stage people are into deep sleep
Improper sleep can cause issues such as insomnia, hyper tension, lack of concentration, irritation etc.
