Choose your roommates carefully. The key is to learn as much as possible about your potential roommates before living with them. It’s not always easy to tell what someone will be like as a roommate before actually living with them, but try to gauge as much as possible. It could be the difference between a great, happy living space and a toxic one. Here are a few things to avoid in a roommate:

1. Someone whose sleep schedule is opposite yours

This is never good for either person. If you know that you like to sleep in, but you have a roommate who gets up at 7am and makes a ton of noise, this is going to disrupt your sleep and leave you annoyed. Conversely, if you’re someone who goes to bed late, while your roommate goes to bed early, they might be annoyed if you’re up making noise. Your sleep schedules don’t have to be exact, but it will be a great advantage if you can find someone who goes to bed and wakes up at approximately the same time as you, give or take an hour.

2. Someone who doesn’t care about studying

Even if you don’t think you care about studying, having a roommate who doesn’t care will only be more detrimental. It’s important to surround yourself with people that will motivate you. If your roommate spends all day watching TV in the living room, you’ll be more tempted to join them and neglect your work than if she was studying in the apartment.

3. Someone who will constantly be inviting people over

Some people might enjoy this, but even for social butterflies, having a constant stream of people in your apartment can be a bit much, especially when you’re tired or stressed. Ideally, find a roommate that will check with you before they invite people over to make sure you’re ok with it.

4. Someone who you don’t know

This may not always be possible to avoid (and sometimes it can be a blessing in disguise), but it’s best to live with someone that you already know. This will make it easier to talk to them if you have a problem with the living situation, and generally will make it more pleasurable for you if you are friends with the person you live with and want to hang out with them when you’re not studying.

5. Someone who is passive-aggressive

This is the worst trait in a roommate. It’s hard to tell how passive aggressive someone is before you actually live with them, so unfortunately you may not realize until it’s too late. Communication is key. It’s going to create a lot of tension in the apartment if instead of speaking to you when they have a problem, they leave notes all over the apartment, or speak to you in a rude, unconstructive way.