Riding at night is usually:
Easier than riding during the day because you can more easily see the lights of other vehicles.
More difficult than riding during the day because it is harder to see.
Not allowed on highways.
Less distracting than riding during the day.
Riding safely at night is challenging because it is harder to see and be seen than it is during the day. The absence of normal shadows and light contrasts makes it harder to judge distances.