If you feel like you're having too much sleep and you would like to correct that 'issue' as soon as possible, you might want to check out the most recent Humble 'Strategy' Bundle. As its name would suggest, the bundle is filled to the brim with all sorts of strategy games, most of which are more than capable of absolutely devouring your free free time as you endlessly attempt to take "just one more turn."

You can find the full list of games, as well as the pricing tier they appear in, in the brief overview right below. Have a gander:

Pay $1 (about €0.88) or more to unlock:

• Niche - a genetics survival game

• Ashes of the Singularity: Escalation

• Throne of Lies The Online Game of Deceit

Pay $9 (about €7.96) or more to also unlock:

• Stellaris

• Plague Inc: Evolved

Pay more than the average of $9.79 (about €8.66) to also unlock:

• Dungeons 3

• Offworld Trading Company

• Offworld Trading Company: Jupiter's Forge Expansion Pack

Pay $15 (about €13.26) or more to also unlock:

• Sid Meier’s Civilization VI

As for which pricing tier you should go for, that will really depend on how much you enjoy strategy games. If you're completely new to them and you have no idea what you're doing, I would recommend going for the second tier as that would give you access to Ashes of the Singularity, Stellaris and Plague Inc, all three of which are distinct yet still highly enjoyable games. 

On the other hand, if you're more of a veteran, I would honestly recommend picking up all of them. There's a pretty nice mixture of games on offer here, and even though Civilization VI is a bit incomplete without its expansions, it's still well worth checking out.  

Whatever your decision may be, I hope you have fun!