Yes, it is permissible.

Is it permissible for the mujahideen to break their obligatory fast to give them stregnth during the battle?

Fasting | March 30, 2014 10:15 am
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Is it permissible to observe a nafil fast without making intention in the night?

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Does wet-dream spoils fasting, and what is someone that had a wet-dream while fasting suppose to do? Can the person continue with the fasting?