Margaret Thatcher was famously said to get by on just four hours' sleep. And half of Britons now say they regularly survive on the same amount – with more than four in ten getting less than three hours. Mood swings (37 per cent), lack of motivation (33 per cent), getting annoyed easily (33 per cent) and feeling anxious (28 per cent) are also side-effects from not getting enough shut eye. 'But luckily there are some things we can do to help get better sleep and manage these side effects. Bradley Fishwick, Senior Design Engineer at Syson, said: 'The research shows that many people are looking for ways to sleep better, especially during the colder, darker months.