Between their crazy schedules and upside-down circadian rhythms, teens always have been somewhat sleep-deprived. Now technology is making it worse. Teens are not just texting, instant-messaging and surfing Facebook all day; they’re sleeping with their cell phones or laptops, too. Or rather, not sleeping. And doctors and parents, many of them raised in an era when phones were attached to walls, are concerned. The average teen sends 2,899 text messages a month – that’s 97 a day. And, according to a new study conducted in Belgium, some 44% of those kids are waking up in the middle of the night to answer their phone or send a text. We explored the issue in depth in yesterday’s Times and Trib, talked to experts and kids, and pulled up some suggestions for how parents can help their kids – including a very simple and practical suggestion from San Jose psychologist David Marcus on how to help your teen see that life’s better when you’re not exhausted.