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