Which option completes the paragraph below correctly?

In places with electricity, artificial lighting has prolonged our experience of daylight, allowing us productive for longer. At the same time, it has cut nighltime short, and so to get enough sleep we now have it ali in one go. Now, "normal" sleep requires forgoing the periods of wakefulness that used up the night; we simply don't have time for a midnight chat with the neighbor any longer. "But people with particularly strong circadian rhythms continue up in the night.

(https ://amp.livescience.com)