Just buying a new Popular Science magazine used to keep me up most of the night. The 'net is like a constant supply of all the magazines, and it comes with very flashy AV. I won't watch video with an unsteady camera or rapid scene changes. An even bigger sleep hazard is human contact. If I get more than an hour of that, there is often trouble getting to sleep. If I have to stay awake because of some external disturbance, it takes me that much time again to settle down, by which time morning noises may be about to begin. I only visit a city every month or so, and that always upsets my sleep. I have only slept right through the night once since my divorce last century, and sometimes need 3 naps to function. I had a bout of amnesia brought on by a perfectly untimely awakening, and worry that the next one might be permanent.
The ways I have found to mitigate this began with eliminating the hazard of landlords by moving to a remote area with cheap surplus housing. I have a "traffic light" for my door, with instructions to not knock if I am sleeping or otherwise have red set. Someone once knocked when I'd only gotten up to pee, and that ruined my next month. I try to eat my meals at set times, in hopes of re-establishing a strong circadian rhythm. I also find that as well as sleep, I need meditation, like a detergent for the grime of over-stimulation from these glowing screens. Without some of that, sleep is poor.