In hard mode you should only be able to sleep after Midnight!

In the game you can currently sleep as soon as the Dusk starts which allows you to easily skip any challenge that the Night would have to offer... So i think that at least on Hard Mode you should only be able to sleep after Midnight(when the dark side of the clock is fully exposed), this way adding more challenge to a mode that's supposed to be difficult!

 The message when trying to sleep before Midnight would be: "You can only sleep at Midnight, good luck in the wild!"

Beds are probably one of the strongest items in the game since you can just easily avoid the Night, use it to reduce fall damage, great for mining for Ancient Debris and one of the most important items in speedrunning... A nerf at least in the sleeping mechanic would be well deserved while still maintaining the item as incredibly valuable!