Is it ok to randomly drift in and out of sleep randomly?

Whenever I read, study or stay still for a certain amount of time, I start to feel my eyelids get extremely heavy and usually end up feeling drowsy and sleepy. If it persists I sometimes fall asleep and wake up a few minutes later. Note: I have had a regular sleeping schedule and whenever I wake up I feel awake and ready to start the day. Is this normal?

Is It OK To?
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