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NREM Stage 1, accounting for 5-10% of total sleep in monophasic adults, is the lightest of all NREM Stages. During this stage, awareness to the external environment and consciousness is diminished. Some people experience hypnic jerks or hypnagogic hallucinations during this stage. A mix of [[Wikipedia:alpha waves|alpha waves]] and [[Wikipedia:theta waves|theta waves]] are present in this stage.
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