If it's because your eyes don't close completely, a sleep mask (or taping
your lids shut) might help.

Otherwise it may be one of those problems without a solution.

-MT

Yes.

Do 100 long swings before going to sleep and
another 100 in the morning after awakening.
Then sit and keep your eyes closed for 15 minutes straight.

After several days report back here.

PS: long swing is defined down here at no. 6.

Fundamentals
By
W. H. Bates, M. D.

       1. Glasses discarded permanently.
       2. Central Fixation is seeing best where you are looking.
       3. Favorable conditions: Light may be bright or dim. The
    distance of the print from the eyes, where seen best, also
    varies with people.
       4. Shifting: With normal sight the eyes are moving all the
    time.
       5. Swinging: When the eyes move slowly or rapidly from side to
    side, stationary objects appear to move in the opposite
    direction.
       6. Long Swing: Stand with the feet about one foot apart, turn
    the body to the right-at the same time lifting the heel of the
    left foot. Do not move the head or eyes or pay any attention
    to the apparent movement of stationary objects. Now place the
    left heel on the floor, turn the body to the left, raising the
    heel of the right foot. Alternate.
       7. Drifting Swing: When practicing this swing, one pays no
    attention to the clearness of stationary objects, which appear
    to be moving. The eyes wander from point to point slowly,
    easily, or lazily, so that the stare or strain may be
    avoided.
       8. Variable Swing: Hold the forefinger of one hand six inches
    from the right eye and about the same distance to the right,
    look straight ahead and move the head a short distance from
    side to side. The finger appears to move.
       9. Stationary Objects Moving: By moving the head and eyes a
    short distance from side to side, being sure to blink, one can
    imagine stationary objects to be moving.
       10. Memory: Improving the memory of letters and other objects
    improves the vision for everything.
       11. Imagination: We see only what we think we see, or what we
    imagine. We can only imagine what we remember.
       12. Rest: All cases of imperfect sight are improved by closing
    the eyes and resting them.
       13. Palming : The closed eyes may be covered with the palm of
    one or both hands.
       14, Blinking: The normal eye blinks, or closes and opens very
    frequently.
       15. Mental Pictures: As long as one is awake one has all kinds
    of memories of  mental pictures. If these pictures are
    remembered easily, perfectly, the vision is benefited.

--
"It is not faith that cures, but a proper use of the eyes."