The feeling you describe is somewhat ambiguous and could potentially match with many things, such as:

- Sleep Paralysis
- Narcolepsy
- Neuropathy
- Phantom Limb Syndrome
- or simply your foot "falling asleep", which is a form of Paresthesia 

If you could please describe your symptoms in more specific detail, I might be able to better assist you by narrowing down the possibilities.  Or would you like to know more about any of the syndromes I listed?
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