Читать книгу Sleep: The secret to sleeping well and waking refreshed - Prof. Idzikowski Chris - Страница 26
must know
ОглавлениеDeep sleep
• Deep sleep usually occurs during the first three hours and takes up to 20-25 per cent of the night.
• Stage 2, or light sleep, occupies around 50 per cent of the night.
• REM sleep occupies around 25 per cent of the night.
