Can someone explain why flights from Europe to North America often leave in the morning or early afternoon, but flights from North American to Europe often leave at night?

When I fly back to the US from Europe, the flight usually leaves between 10am and 2pm (although there are some that leave later). This puts me back in the US between noon and 5pm. This is perfect because with jet lag, I can goof off for a little bit then go to bed.

However, when when I fly to Europe from the US, the flight often leaves between 6pm and 10pm. This gets me to Europe between 7am and 11am. This means you are stuck staying awake the entire day.

Since flights leave Europe in the morning, why can't they leave the US in the morning?