An inability to sleep continuously through the night is not an illness in itself, nor is it necessarily the symptom of a disorder. Because of great individual differences in sleep patterns, what one person considers to be insomnia may be regarded as normal by another individual.
Some people simply require less sleep.
Older people, for instance, tend to sleep less, more lightly, and with more interruptions than do younger people. Peace of mind is essential to falling asleep, and it is important to have a warm, comfortable bed in a quiet bedroom. The last several hours before going to bed should be as relaxed as possible. Physical exercise of some kind during the day and a walk in the fresh air after dinner are also beneficial for a good night's sleep. It also helps not to nap during the day.