So rest comes in stages (simplified) and each stage lets your body process and repair things it needs to get back to working order. The deeper sleep does important things that make you groggy if interrupted, but the first stage isn’t as intensive.
So its like doing the stretches for a workout, and not feeling exhausted yet, but being ready for more! (where deeper sleep would be like doing the workout, but being interrupted before you got a chance to “rest, recover, hydrate, etc” so the workout is detrimental for now: you’re ‘groggy’ )
P.S> Search the history of this subreddit, pretty sure this has been asked multiple times now (try “power nap” e.g.)
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