10/20/2026
Waking up at night with a calf cramp? It may start with how you sat all day.
Sitting for hours shortens the calf (gastrocnemius/soleus) → your ankle can’t dorsiflex well → the toe flexors (FHL/FDL) pick up the slack → lie down, toes point, and the cramp hits.
What to check and do:
Ankle dorsiflexion ROM — knee straight vs. knee bent
Knee straight limited → gastrocnemius
Knee bent limited → soleus
Calf stretching for both muscles, plus ankle joint mobilization
Towel stretch that includes the toes to lengthen FHL/FDL
Why it matters: Tight calves force smaller foot muscles to overwork. Finding which muscle is limiting tells you exactly what to stretch, instead of guessing.
📌 Evidence note: The exam and treatment above come from the APTA Heel Pain–Plantar Fasciitis CPG (Grade A). The cramp mechanism itself is hypothesis-level, and the CPG doesn‘t address nocturnal cramps directly.
Save this for tonight 💾
For clinical reference only, not a diagnosis. See a clinician if cramps are frequent, severe, or one leg is swollen and painful.
OrthopedicPT StretchingRoutine DPT OCS