Yes, it is. Getting adequate and appropriate sleep is ideal at the best of times and even more important of you have any health issues. Sleep issues are a risk factor for many, if not most medical and health conditions and what goes wrong with the foot is no exception.
This research showed an increased risk for foot injury in those with sleep disorders. This study showed those with diabetic foot ulcers have issues with sleep.
A whole episode of PodChatLive was devoted to sleep disorders in podiatry patients and is well worth watching: