fall v OED ~ 80 d fall back 'fall into arrear' obs (1786); OED 100 a 'of the eyes: to close' obs (1300).
   In phr fall back: to go into debt.
   1924 ENGLAND 257 The merchants, if so disposed. have everything all their own wav. Once the men 'fall back,' they are sometimes never again able to 'put up money' or to 'straighten up,' i.e., pay their bills.
   fall together: of one's eyes, to close drowsily.
   C 66-10 I heard this said when John was leaning on the table and his eyes were falling together because of sleep.

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