Psychology / Unit 3 Psych 0330 short lesson, about 20 seconds
Insomnia
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The idea
Insomnia is persistent difficulty falling or staying asleep, occurring at least three nights weekly for at least one month.
In practice
A person lies awake for over an hour most nights and functions poorly through the following day.
Where people slip
Occasional bad nights are not insomnia. The diagnosis rests on persistence and on daytime consequence.
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