It isn’t necessary, just might work better for you.
I actually sleep (and study) better with sound. Seems kind of oxymoronic, but with sound (music, tv, white noise, fans, etc) it gives me something to focus on, almost a meditation point. Eases my mind, lets me fall asleep fast.
With silence, I have no focus point, my mind races and I can’t fall asleep near as well.
Side note, studying was/is the same for me. Libraries were actually counter productive to my studying in college. But I had no problem sitting for 4-6 hours at a coffee house studying for tests.
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