Quality of sleep is critical. It also gets an amazing lack of...shall I say "respect".
Most people have neighbors. Houses are often built poorly insulated. City regulations often have a very tight window of "quiet" hours (eg: 11pm to 7pm), that are only barely enforced, if at all. Stuff like you mentioned, lights and such, don't help. So you have a ton of undersleeping people, which is likely to affect society as a whole quite drastically.
Most people have neighbors. Houses are often built poorly insulated. City regulations often have a very tight window of "quiet" hours (eg: 11pm to 7pm), that are only barely enforced, if at all. Stuff like you mentioned, lights and such, don't help. So you have a ton of undersleeping people, which is likely to affect society as a whole quite drastically.