A male Ectemnius cavifrons ^[1,2] on the beehotel.
This year these bees were frequent visitors on the beehotel when the day started to near its end. They use the beehotel for sleeping. Finding a fitting sleeping spot turned out not to be an easy task as they spent a substantial amount of time inspecting all available cells accross all nesting blocks before finally crawling in one for the night.

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References

¹ Nederlands Soortenregister

² Hermann Dollfuss, "Bestimmungsschlüssel der Grabwespen Nord- und Zentraleuropas (Hymenoptera, Sphecidae) mit speziellen Angaben zur Grabwespenfauna Österreichs", Publikation der Botanischen Arbeitsgemeinschaft am O.Ö.Landesmuseum Linz, LINZ, 20. Dezember 1991