A common trigger is stress. Even if you fall asleep easily in the evening, your nervous system can become active during the night. The stress hormone cortisol naturally rises in the early hours of the morning. If you’re feeling stressed, this rise can cause you to wake up – and your mind immediately starts racing.
Physical processes can also disrupt sleep:
- slight fluctuations in temperature
- night-time sweating
- digestive activity
- fluctuations in blood sugar levels
The body is more sensitive to changes at night than during the day.
Light sources, noises or a room that is too warm can also cause you to wake up from a lighter stage of sleep.
Hormonal changes – for example, during certain stages of life, such as the menopause – can affect sleep patterns. Here, too, the nervous system reacts more sensitively to internal stimuli.
For many people, the real problem isn’t waking up itself, but lying awake afterwards. As soon as thoughts start to intrude or a sense of restlessness sets in, the nervous system becomes further stimulated.
The greater the pressure becomes (‘I have to sleep now!’), the harder it is to let go.