Help me find this sleep research manga please.

[Dirchesdan]

There's two cousins who live together. The older female cousin is a teacher and loves to sleep and researches it. The younger male cousin is in love with the other one and is her student at school. That's all I remember, I forgot the title and any of the characters.

 

[schlo]

@Dirchesdan
this one?
https://mangadex.org/title/21204/koi-to-utatane

 

[Dirchesdan]

@schlo Yeah that's it. Thanks for the help.