Snoring, and the one pattern to take seriously
If you are sleepy in the day despite spending plenty of time in bed, the problem may not be how you sleep at all. It may be your breathing while you do it.
The pattern to look for: you snore, or somebody has seen you stop breathing or gasp in the night, or you wake with a headache or a very dry mouth, or you fall asleep in the day in situations where nobody would expect it. That combination is sleep apnoea until a doctor says otherwise.
It is common, and it is very commonly missed, particularly in people who have been told for years that they just need better habits. It is also treatable, often extremely well.
No amount of anything in lessons two to five will touch it. If that pattern is yours, the next step is a doctor and a sleep study, not more of this course.