[Isaac]

In actuality, it is a very compulsory to save certain amount of money because that is exactly what you need to gain enough income because you can actually invest such money to make money.

[Nsikan]

Or I will say going to bed early and waking up late? That way have a considerable time of the day sleeping, hence less need for electricity.

This is the better model. You sleep as early as 7pm which means your lights would be off by that time and wake up around 8am which implies the day has fully broken and one can make use of daylight.