Getting up earlier than usual or
sleeping a couple of hours late can have a significant effect on your mood,
according to research published in 1997. When the body’s internal clock, or
circadian (生理节奏的) rhythm, gets {{U}} (67) {{/U}} of accord with your
sleep-wake {{U}} (68) {{/U}}, you can be left {{U}} (69) {{/U}}
out of sorts. Researchers have long known that moods vary along
{{U}} (70) {{/U}} fluctuations in functions regulated by the body’s
{{U}} (71) {{/U}} 24-hour cycle rhythm, such as body temperature and
hormone levels. The {{U}} (72) {{/U}} of time a person has been awake is
also known to {{U}} (73) {{/U}} mood. To tease apart the two effects,
U.S. and U.K. researchers {{U}} (74) {{/U}} 24 healthy volunteers to live
in {{U}} (75) {{/U}} chambers for approximately three to five weeks and
{{U}} (76) {{/U}} their sleep-wake A. in B. for C. at D. to
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Getting up earlier than usual or
sleeping a couple of hours late can have a significant effect on your mood,
according to research published in 1997. When the body’s internal clock, or
circadian (生理节奏的) rhythm, gets {{U}} (67) {{/U}} of accord with your
sleep-wake {{U}} (68) {{/U}}, you can be left {{U}} (69) {{/U}}
out of sorts. Researchers have long known that moods vary along
{{U}} (70) {{/U}} fluctuations in functions regulated by the body’s
{{U}} (71) {{/U}} 24-hour cycle rhythm, such as body temperature and
hormone levels. The {{U}} (72) {{/U}} of time a person has been awake is
also known to {{U}} (73) {{/U}} mood. To tease apart the two effects,
U.S. and U.K. researchers {{U}} (74) {{/U}} 24 healthy volunteers to live
in {{U}} (75) {{/U}} chambers for approximately three to five weeks and
{{U}} (76) {{/U}} their sleep-wake A. free B. rid C. out D. over
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