完形填空

The spring and summer months can make sleep feel impossible, with everything from sweltering（闷热的）temperatures and1late—night barbecues（户外烧烤）to loud birdsong and early sunrises to fight with.

"It's2common to have the unusual bad night, " says Dr Allie Hare, sleep consultant （睡眠顾问）at the Royal Brompton hospital in London. "As soon as you try to sleep, you won't sleep. "

In summer, our day—to—day3can change. "A regular bedtime and getting—up time is, of all the things I recommend（挑行）for good sleep, possibly the most important. "4Hare.

"The brain doesn't like getting too hot, " says Jim Home, a professor of psychophysiology（楷神生理学） at Loughborough University. You could open a window, but that5letting noise and light in.