Unable to get off, recall vacuous Smiths album and vacuous lyrics (9)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

Reversal of ( recall ) [ all inner letters deleted from( vacuous ) “ Smiths ” + ELPEE(or LP, abbrev. for a long playing record/album) plus ( and ) all inner letters deleted from ( vacuous ) “ lyrics ” ]. Defn: … to sleep.