Shower: Unfortunately, there is no conclusive peer-reviewed evidence that it is, in fact, a good morning. A randomized trial found that many mornings are bad.
Caveats: Only applies to mornings. No rigorous paper exists for evenings, so this remains an unknown.
Caveat: It's unspecified whether the friend wishes reader a good morning, or means that it is a good morning whether reader wants it or not; or that they feel good this morning; or that it is a morning to be good on?
Shower: Unfortunately, there is no conclusive peer-reviewed evidence that it is, in fact, a good morning. A randomized trial found that many mornings are bad.
Caveats: Only applies to mornings. No rigorous paper exists for evenings, so this remains an unknown.