If I don't take Modafinal (Provigil), this body goes into a sleep phase within minutes of not moving. I've had spoons fall from my grasp mid-meal, books fall to the floor and have been jarred awake at the computer by my chin hitting my chest.
The neuro said that it wasn't narcolepsy (according to the EEG) and was likely an extreme form of MS related fatigue.

If it becomes a problem, you might ask about Modafinal.

With love, Erika