New study reviews effect of coffee on people's sleep and wake cycles The Institute for Scientific Information on Coffee (ISIC) published a new report today, titled 'Coffee and sleep in everyday lives', authored by Professor Renata Riha, from the Department of Sleep Medicine at the University of Edinburgh. It reviews the latest research into coffee's effect on sleep and suggests that while drinking coffee early in the day can help support alertness and concentration levels, especially when sleep patterns are disturbed; decreasing intake six hours before bedtime may help reduce its impact on sleep. Coffee is largely consumed daily for the pleasure of its taste, as well as its beneficial effect on wakefulness and concentration (due to its caffeine content). This may be particularly the case for those experiencing restricted sleep, and those adjusting to new sleep/wake cycles, such as shiftworkers.