宵っぱり

よいっぱり

night owl; nighthawk; late bird; to stay up late

Also written 宵っ張り

Meaning

n
night owl; nighthawk; late bird
vs
to stay up late; to keep late hours

Example sentences

私もそうだが、ＩＴ業界には宵っ張りの人が多いに違いない。

I'm one too, and I'm sure there are lots of night-owls in the IT world.
私は宵っ張りするのは慣れています。

I'm used to staying awake late into the night.