In the June 24 issue of The Journal of Neuroscience, a new imaging study that helps explain why sleep deprivation affects some people more than others is featured. Two test groups were selected based on their genetic makeup and were asked to work on memory tasks the night before and morning after a good night’s sleep and then again the night before and morning after a sleepless night. After a night of no sleep, those who are genetically vulnerable to sleep loss showed reduced brain activity, while those who are genetically resilient showed expanded brain activity. The findings help explain why we all differ in our abilities to compensate for lack of sleep. To read the article in full and learn about other sleep-related findings, go to sciencedaily.com.

PJ: I have trouble sleeping. Periodically, I’ve been taking Tylenol PM at night and I definitely do not want to make that a habit. I’m considering getting a foam mattress but don’t know where to start.

Dr. Drake: Thank you for your mattress question, PJ. I’m sorry to hear you’re having trouble sleeping. For choosing a mattress, foam ones are excellent for those who have a preference for very soft mattresses, but for people who experience pain or pressure points that disrupt their sleep they may find more comfort in firm mattresses.

However, a foam mattress is a costly item. My recommendation is to get a foam cover (2-3 inches thick) to put on your current mattress before buying a brand new one . Although not the same as an actual foam mattress this may help you sleep better and will also give you more time to decide which type of mattress is the best fit for your body.