The tram is 3.10 euros (about $3.50) one way, and tickets can be purchased on board and at kiosks around the city. If you purchased a 24-hour public transport ticket, your tram fare is included.

If you find yourself regularly sleeping six hours a night, you're not alone. Although most of us know sleep is essential for optimal health, getting enough of it every night is easier said than done.

We tried sleep earbuds and earplugs from Ozlo, Anker Soundcore, 1More, and Loops — and three stood out as the best (and worth checking out during Prime Day).