The findings from night cramp treatment firm Crapex finds a quarter would tell off tired looking staff or bring the issue up at appraisal - but 77% of Brits can't help yawning as they feel exhausted throughout the working day.
A tenth of respondents admit to being so tired at work they have pretended to feel sick in order to go home to bed, 14% arrive at work looking scruffy and unwashed as they are so tired and 50% crave coffee to get them through the day.
More than one in 10 members of staff (11%) have had to nap at work and 4% have dozed off during a meeting.
Two thirds lose concentration at work due to tiredness and 46% admit they are less productive when tired - one in 20 have injured themselves at work due to fatigue.
