Prolonged plantarflexion of the ankle, such as during sleep, can reduce ankle mobility and calf flexibility.

“And like in sleeping and sleeping at night you know your feet are down and especially if you have like if you keep those those blankets tight at the end of your bed they're down quite a bit and you're spending six seven eight hours in that position like you're not doing yourself any favor in terms of you know encouraging mobility at the ankle and mo and flexibility through calves.”