Slumberles or Slumberless: How To spell?
The word Slumberles is misspelled against Slumberless, an adjective meaning "Without slumber; sleepless."
Slumberless has double 'ss' in the end mispronounced as 's'Remember double 'SS' appears in the end of this word which should not be misspelled with single 'S'
Wrong Spelling:  slumberle-s  Correct Spelling:  slumberle-ss 
Check more misspelled words of Slumberless to spell it correct.