In a small longitudinal study of women, longer sleep was associated with greater sexual desire the following day. An additional hour of sleep was also associated with a higher likelihood of partnered sexual activity the next day. But it was a pilot study in women, so specific effects should not be generalised to everyone.
Nor does the result mean there is a universal dose of sleep after which desire automatically switches on. Sleep is entangled with mood, stress, energy, health and relationship routines. The direction of the association may also run both ways.
So what I find interesting here is not the idea of “treating libido with sleep,” but a different way of looking at desire.
We often treat it as a separate function: want / don’t want. But sexuality exists inside the same body that works, worries, recovers and loses sleep.
When that body is permanently running on low battery, reduced sexual interest starts to look considerably less mysterious. Before demanding the old level of desire from ourselves, it may be worth giving the body a chance to stop living in power-saving mode.