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Sorta like hunger and thirst. REM dep is like thirst—if you model your body as having reserves, they can only last a day or so before things start going weird. SWS dep is like hunger—fasting for a day, you feel it, but after a few days it's like WHOA.
But also totally different from that. The point is, the kind of happy loopy drunk sleep dep seems characteristic of "I haven't gotten enough REM sleep the last day or two" but there's a qualitatively different thing (
→
-wall) that happens after days of no SWS.
