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When your Wi-Fi is running smoothly, it feels like everything is right in the world. But when there's any disruption, it can feel like a day-ruining experience. Even worse, tracking down the problem can be difficult. Thankfully, these apps can help pinpoint what's causing Wi-Fi difficulties.

Did you know you can still be functional on only four hours of sleep? It’s not ideal, but, in a pinch, it can be done — as long as you fall asleep at the right time, that is.

This incredible calculator from Sleepytime works by analyzing your sleep cycles and counting backward to determine the ideal times for you to fall asleep. When you wake up mid-cycle, you feel groggy and drained. If you wake up between cycles, you’ll feel much more alert.

A solid eight hours is always best, but this is a good resource to have up your sleeve, just in case.

Remember when phonebooks the size of Manhattan landed on your doorstep? Those days are long gone, so how do you actually look up someone's phone number now? It's even trickier than you may think, especially finding cellphone numbers. We're here to help with four smart ways to find anyone's number online.

Our phones are our lifelines to our friends and family, but what happens when we can't reach everyone we care about when we really need to? You can set up your phone to do it for you. We've got the steps to alert your trusted friends and family in case of an emergency.

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