Experts have attributed the 3-5 am waking time to fluctuations in blood sugar levels. A slight drop in sugar levels triggers the release of cortisol and adrenaline which may also disrupt sleep.
The third essential element of quality sleep is temperature, with Atkinson pointing to between 18 and 21 C (64 to 70 F) as the ideal range. Sound is another element of good sleep, according to sleep ...