Sex-specific behavioural symptoms of viral gut infection and Wolbachia in Drosophila melanogaster

•The behavioural effects of infection are sexually dimorphic in D. melanogaster.•Infection with Drosophila C Virus (DCV) causes females but not males to sleep more.•Wolbachia does not alleviate DCV-induced somnolence in females.•Male flies carrying Wolbachia are more lethargic when awake.