From time to time everyone gets grumpy, but if you find yourself ill-tempered on a regular basis you may not be getting enough sleep.
According to Sammy Margo, sleep expert and author of The Good Sleep Guide and The Good Sleep Guide for Kids, those who regularly have disrupted or too little sleep will "feel irritable, grumpy, miserable and annoyed".
"There is a strong link between sleep deprivation and depression," she added. However, it is often hard to tell whether the depression is causing the lack of sleep or if mental health problems have been caused by not getting enough rest.
To ensure you have a sunny disposition, it is important to get into a regular sleep pattern, making it possible to get seven hours rest each night.
If you believe there is something stopping you from sleeping, such as stress, then try to tackle the problem at its root.
Once a normal sleep routine is established, people should notice a change in their mood and attitude.
Read about support and personalised care at Barchester care homes for anyone with mental health concerns.