I've noticed that my legs fall asleep at least a couple times a day now, because I keep crossing one under my butt when sitting at my desk. I don't even know why I keep sitting this way--I never used to--but I imagine my body is subconsciously moving into a more comfortable position. Maybe you're doing something similar? Shifting your weight onto your toes without realizing it?
Re: what can this be
Low progesterone
Baby boy born 01/2016
Currently: NTNP
Low progesterone
Baby boy born 01/2016
Currently: NTNP
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