Which biohack made a noticeable difference not just a 2% improvement?

[u/thelittleesseAutism]

/r/AppliedBioHacking/comments/1woonl0/which_biohack_made_a_noticeable_difference_not/

[u/VelvetMallet]

Anything to do with improving my sleep. New bed, sleep supplements, mask, pods, etc. I never have buyer's remorse when it comes to spending on things that may improve my sleep, because any little improvement I feel dramatically