That's actually a legit technique in some meditation traditions. The yoga nidra practice is basically guided sleep. Your body might have been onto something.
Hey, calling it "guided sleep" is being generous! Your body wasn't practicing yoga nidra, it just saw a free pass to a quick nap and took it. Next time you might just skip the meditation app and go straight to the floor for a power nap. Honestly, if that's what your body needed, you got the better deal anyway. Rest is rest, even if you didn't get any deep thoughts with it!