This isn’t really “payback,” it’s more your sleep system getting out of sync. After a good night, your sleep pressure resets, so you don’t feel as naturally sleepy the next night, but your circadian rhythm may still be stuck in the old pattern. That mismatch can leave you feeling oddly alert at bedtime even though you slept well before. It often shows up in people with irregular sleep or insomnia cycles, where one better night temporarily shifts timing but doesn’t fully stabilise it. The result is a good night followed by a “wired” one. The most helpful fix is usually consistency rather than reacting night to night especially keeping a fixed wake time so your rhythm doesn’t swing back and forth.