Actually a bed mode will make a substantial difference.<p>Looking at phones or laptops or whatever screens at nighttime suppresses melatonin, which leads to people not feeling sleepy when they should, which makes them much more likely to continue looking at their screen than if they became as tired as normal.<p>It’s certainly possible to stay up doing something without blue light (e.g. reading by candlelight or a dim incandescent flashlight), but blue light makes a huge difference, and actively fights people’s ability to exercise self control.<p>Working to change habits is all well and good, but instead of telling someone who habitually binges on candy and cookies to stop eating any snacks at all, period, it would be a more successful intervention to take the candy and cookies away and fill their refrigerator with carrot sticks.