There are a few reasons why streamers go live at night on Twitch, but the most popular reason is that it's more likely to attract viewers. Twitch is a streaming platform where broadcasters can broadcast live video of themselves playing games, drawing in viewers who can chat with them and watch their games in real time. Viewers tend to be more engaged and interested in streaming at night, as it's when people are most likely to be in front of their screens and when they're more likely to be watching content that they're interested in. Additionally, streamers can make more money streaming at night because there are typically more viewers and adverts are more likely to be seen.