IPA: /ˈsliːpiər/
KK: /ˈslipɪər/
Feeling more inclined to sleep than usual; drowsier.
After a long day at work, I felt sleepier than ever.
Comparative: sleepier
Superlative: sleepiest
Sleepier → It is formed from "sleep" (from Old English *slæpan*, meaning to rest or be in a state of sleep) and "-ier" (a comparative suffix meaning more). The word "sleepier" means more inclined to sleep or in a state of greater drowsiness.
Think of the word 'sleep' which means to rest, and the suffix '-ier' indicates a comparison, so 'sleepier' means more inclined to rest.