I have many friends who leave their PCs and networks on 24×7 and there is reliability in modern equipment. Still, it’s even more beneficial to shutdown & even power off electronics (as I always unplug during t-storms). However, there is also a legitimate need for the 24×7 up time, in order to leave alarm systems & some smart home devices enabled at all times. Below is an excellent article from Kim Komando discussing view points for both options:

Do you power down your home network when you're not using it? Should you? Here's why and how.

QUOTE:     Why power down your home network? — Ultimately, we here at Komando.com feel the same way about your home network as we do about leaving your computer on all the time; it should be off when you’re not using it. The key term here is “when you’re not using it,” but we’ll get into that, and other factors about this, below.

In addition to saving some money on your power bill (not an insignificant drive for many of us), unplugging your home internet network when it’s not in use can protect your device from power surges. Power surges are more likely to occur in devices that are plugged in all the time, so unplugging your modem and/or router can keep them from being damaged by random increases in electricity flowing through their wires.

By unplugging, you’ll be able to leave your house comfortably, knowing you’re saving power and keeping your network safe from intruders. You can keep yourself from having to literally unplug by putting the router and modem on a power strip or surge protector that has a power switch. Just flip the switch before you leave the house, and you’re all set.

Turning off your home network might mean going through some steps to reconnect devices once it’s back on. But since turning it off and on is so easy, and turning it off for parts of your day keeps the power bill down, and the security of your system up, it’s worth the mild inconvenience. Make sure you power down your home network when you’re not home, or when you’re asleep, via any of the methods we’ve suggested above