If you take a Naproxen, will you feel a leg cramp?

You've received some excellent suggestions already! I just wanted to add that if your potassium is low, this can also cause cramps. Adding a fruit or vegetable high in potassium may help - personally I like bananas. You can also try rubbing on a topical medication like Icy/Hot or Mineral Ice before bed. There are versions of these rubs that come in vanishing scent if you don't care for the smell. Between all of us I hope something we've suggested ends up working for you! :)
Lisa

Hi Suzanne has given you some great suggestions. I just wanted to add to that, Naproxen can cause muscle weakness & pain, so this could be the reason. I would suggest discussing this with your doctor. Another thing that comes to mind is your daily salt intake, are you getting enough salt in your diet? If not, this is a very common reason for cramping also. Just wanted to add that as this is a problem for me.

Night leg cramps are painful, involuntary spasms, aching or contractions of muscles in your legs.
Most of the time, night leg cramps occur for no known reason, and they're usually harmless. In general, night leg cramps are likely to be related to muscle fatigue and nerve problems.
In rare situations, night leg cramps can be associated with an underlying disorder or a medication you are taking.
Activities that might help prevent night leg cramps include:
Drinking plenty of fluids to avoid dehydration.
Stretching your leg muscles or riding a stationary bicycle for a few minutes. before you go to bed.
Untucking the bed covers at the foot of your bed.
Activities that might help relieve night leg cramps include:
Flexing your foot up toward your head,
Massaging the cramped muscle with your hands or with ice,
Walking or jiggling the leg,
Taking a hot shower or warm bath.
If you experience severe and persistent cramping then you should see your doctor.

No medication is enough to keep you from feeling those cramps that occur at night.