A small study from Japan shows that shifting sleep patterns can affect the health of recent graduates, reports Reuters.

“We expected these results before the survey because some studies already suggested that acute change of sleep-wake pattern is likely to cause daytime sleepiness and/or psychological distress,” said lead author Shoichi Asaoka of Edogawa University in Nagareyama.

In this study, the change in mental quality of life was larger than for physical quality of life, Asaoka told Reuters Health by email.