As any parents of a young child who is a problem sleeper will confirm, permanent tiredness and constant irritability can put a huge strain on your relationship.
In fact, according to a survey, lack of sleep is a big factor in divorce and separation for a third of couples.
Ahead of a new British series on the subject, a poll carried out for the U.K.'s Channel 4 suggests the average parent gets five hours and 48 minutes of sleep a night.