YOUMOU TO OHANA made "「おやすみ。」" available on July 28, 2009. With this song being around four minutes long, at 3:30, the duration of this song is pretty average compared to other songs. This track is safe for children and doesn't appear to contain any foul language, since the "Explicit" tag was not present in this track. The track order of this song in YOUMOU TO OHANA's "LIVE IN LIVING '09" album is number 3 out of 10. In terms of popularity, 「おやすみ。」 is currently not that popular. Even with the track produces more of a neutral energy, it is pretty danceable compared to others.

「おやすみ。」 テンポ

We consider the tempo marking of 「おやすみ。」 by YOUMOU TO OHANA to be Andante (at a walking pace) because the track has a tempo of 95 テンポ, a half-time of 48テンポ, and a double-time of 190 テンポ. Based on that, the speed of the song's tempo is slow. Activities such as, yoga or pilates, can go well with this song. The time signature for this track is 4/4.

「おやすみ。」 キー

The music key of this track is F Major. This also means that this song has a camelot key of 7B. So, the perfect camelot match for 7B would be either 7B or 8A. While, 8B can give you a low energy boost. For moderate energy boost, you would use 4B and a high energy boost can either be 9B or 2B. Though, if you want a low energy drop, you should looking for songs with either a camelot key of 7A or 6B will give you a low energy drop, 10B would be a moderate one, and 5B or 12B would be a high energy drop. Lastly, 4A allows you to change the mood.