day lark
rise with the lark
nighthawk
early bird
night person
night owl
get up with the chickens
bright and early
matitudinal
at all hours
matutinal
rathe
first thing
ack emma
matutinally
early-morning hour
early riser
morning person
antemeridian
early to bed, early to rise, makes a man healthy, wealthy and wise
lark
oh dark thirty
sunriser
small hours
wee small hours
morning
up with the chickens
up with the lark
matinal
morningness
matutine
sunshine
oh dark hundred
forenoon
tomorning
sparrow-fart
ante meridiem
wee hours
tomorn
go to bed with the chickens
go to bed with the sun
break
waker
seminocturnal
late riser
burn the candle at both ends
get up early
morn
gloaming
dawn