First Beer Goggles, now Sleepy Goggles: How tiredness makes men think women are more amorous than they actually are When men are tired they overestimate how interested women are in them The same effect was not noticed for women Next time a man chats you up his motives might be far from romantic - he could just need some more sleep. Men who are tired are more likely to think that a woman is interested in them, researchers have found. Having just one night of poor sleep is enough to make a man think that he is in with a greater chance with a woman even she has no interest whatsoever. Impaired judgement: Men tended to overestimate women's interest in them after just one night of poor sleep In a surprising twist, the same effect was not apparent in women and they retained their clear-eyed judgement - even if they were worn out too. The study gives a new spin on the idea that men get "beer goggles" after a few drinks which make them feel more amorous. Instead they may now be in danger of having their "sleep goggles" on instead. The researchers asked 60 male and female university students to complete a questionnaire before and after one night of sleep deprivation in which they were deliberately given a bad night's sleep. The questions included their sexual interest, their sexual intent, how interested they were in commitment and a general interest in the opposite sex. One of the questions was: "When a woman goes out to a bar, how likely is it that she is interested in finding someone to have sex with that night?" The responses showed that men's ratings of a woman's sexual interest rises from an average score of 13.5 before the bad night of sleep to 17.5 afterwards. Lead researcher professor Jennifer Peszka of Hendrix College in Arkansas said that the findings were comparable to studies done on the effect of alcohol. Exhaustion: A lack of sleep for men had similar effects to 'beer goggles' in distorting their perception of reciprocated feelings Both impact on the frontal lobe of the brain and affect our ability to make decisions and assess risks, she said. Professor Peszka said: "Sleep deprivation could have unexpected effects on perceptual experiences related to mating and dating that could lead people to engage in sexual decisions that they might otherwise not when they are well-rested... ..."Just as with alcohol, sleepy men are judging women and thinking they are more likely to want sex than they did when they were not sleepy. And just as in the studies that have used alcohol, we found that women were not affected by sleepiness in their perception of sex. No effect: Although the rate of exhausted women is said to be higher than the rate of men, their tiredness did not effect their judgement on attractiveness As to why women did not experience a similar effect, the researchers said it could be because they are looking for different things from men when they are dating. Men, by contrast, are just looking for sex. Professor David Mastin, of University of Arkansas at Little Rock, who took part in the study, said: "Because women are making bigger decisions that are more important to them, they may be making instinctive decisions rather than cognitive ones." Previous research has highlighted how women and not men are the ones who are constantly exhausted. Experts have said that two in three women have been left so exhausted by the demands of modern life that they are living in a damaging state of constant fatigue. They have to juggle being a mother and a wife with having a career - with time for themselves too.