Sleep Apnea (not breathing correctly during sleep ) can have similar symptoms. But you'll also be mighty tired. Or in some cases, people address this by being hyper or using mass stimulants. Inability to concentrate due to sustained sleep deprivation is just the beginning. Worst part, most people who have it never realize it until someone else notices strange breathing patterns in their sleep and they get it checked out. I feel the need to say it 'cause my doctor missed it and sent me to a shrink based on my symptoms. Tiredness, lack of attention, depression, bad health, absent mined, and mega coffee just to function. I never went to the shrink and thanks to my new girl's advice I went to get a sleep study done. Got a special machine called a CPAP to breath with at night. Whammo! I have new life. No joke. Do a google and read the testimonials. I'm awaiting some minor throat surgery to see if I can ditch the CPAP. Probably you don't have it but it is worth looking into if you are thinking about ADD and all the rest of that.