When you wake up from a really deep sleep and have to take a nap before you can get up and start your day.

Similar to a deep sea diver stopping on the way up to decompress in order to avoid getting the bends.
"Sorry I'm two hours late to work. I needed a decompression nap this morning"
"I silenced my alarm clock and took a decompression nap"
by Hobojoe1985 February 3, 2020
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