Can't sleep? Run down? Keep exercising. CSA_Images/iStockphoto.com hide caption toggle caption CSA_Images/iStockphoto.com Shots - Health News Chronic Insomnia? Hitting The Treadmill Could Help ... Eventually August 15, 2013 If you're chronically sleep deprived, don't expect 30 minutes on the elliptical to knock you out tonight. The sleep-boosting benefits of exercise take about four months to kick in for people with insomnia, a study suggests. But perseverance pays off.