Although sportive lemurs, like the red-tailed sportive lemur (Lepilemur ruficaudatus) seen here are nocturnal, they can sometimes be spotted in their sleep holes during the day (Rakotomalala et al., 2017).

Reference:

Rakotomalala, E. J., Rakotodraparany, F., Perofsky, A. C., & Lewis, R. J. (2017). Characterization of the tree holes used by Lepilemur ruficaudatus in the dry, deciduous forest of Kirindy Mitea National Park. Folia Primatologica, 88, 28-41.