This sleeping beauty was hanging inside a flower of Foxglove (Digitalis purpurea). It is a male Chelostoma rapunculi^{[1, 2]}.
These and other bees, will rest in htis posture where they hang using their mandibles. There were actually two of these bees hanging, each in their own flower.

The bee is rather small, approximately 1 cm. The species is recognizable by the hairbands on the abdomen.
The males have a protruding structure on the second belly segment (sternite) ans three stump thorns on the end of the abdomen^{[1, 2]}.

This species is relatively rare in the Netherlands^[1], so very nice that it visits the garden!

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Literature

¹ Peeters, T.M.J., H. Nieuwenhuijsen, J. Smit, F. van der Meer, I.P. Raemakers, W.R.B. Heitmans, C. van Achterberg, M. Kwak, A.J. Loonstra, J. de Rond, M. Roos & M. Reemer 2012. De Nederlands bijen (Hymennoptera: Apidae s.l.). - Natuur van Nederland 11, Naturalis Biodiversity Center & European Invertebrate Survey - Nederland, Leiden.

² wildebijen.nl, "De Nederlandse bijen en hun relaties, overzicht van in Nederland en Vlaanderen voorkomende solitaire en sociale bijen (Apidea s.l.)"