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Re:Deep Sleep May Help the Brain Clear Alzheimer's Toxins by michaelborromeo on Friday November 01, 2019 @04:15PM (#21423240)
Both.

I haven’t done any actual tracking but others have.

There are studies linked at the bottom of this article: https://www.bulletproof.com/sleep/sleep-hacks/inclined-bed-t....

Re:Deep Sleep May Help the Brain Clear Alzheimer's Toxins by sandos on Monday November 04, 2019 @02:27AM (#21439600)
I just this day realized that I did not have any head- or sinus-ache when waking up, and I had used a pillow for once.

An inclined bed would probably be even better.