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Mai falls asleep almost as soon as her head hits the pillow. In the middle of her sleep, she moves nervously, changing sides multiple times.
On several occasions, she traps Naru with her legs. Sometimes she kicks him until he falls off the bed and he can't get back up because Mai is occupying it, in a starfish position.
At times, she falls off the bed in the middle of the night and doesn't realize it until morning, leaving Naru in a panic as he searches for her between the sheets.
She also drools, talks in her sleep, and in very rare cases, bites. There are also moments when Naru has to hold her hand or hug her to calm her down because she's having a nightmare.
Even with all of that, he wouldn't change his sleepyhead wife for anything.