"Science has proven that to be happy requires conscious effort," said Laurie Santos, a professor in the Department of Psychology and Cognitive Science at Yale University in the United States.

"It's not an easy task, it will take time," he told the BBC. But maybe he knows what to do to be happy? Because he taught about 'psychology and beautiful life'.

His class is the most popular among students at Yale University's 317-year history.

The number of students is about 12,000. It is a record in the history of the university.

Professor Santos conducts this course based on positive psychology. It is a branch of psychology that teaches happiness and behavioral change.

But how can we apply these theories in our daily real life?

Professor Santos says that no one is happy with you, so you have to try.

"Being happy is not something that happens to you. You have to practice it to be happy," said Professor Santos. That has to be proven.

Two days a week he teaches students some techniques on how to be happy.

You want to be happy but the problem is you can't get into Yale University anymore?

Here are five tips he gave. You can try to practice.

1. Make a list of gratitude

Professor Santos tells his students to make a list of who they are or what they are grateful for each night.

“It may sound very easy to hear, but we have found that students who practice it regularly feel happier,” said Professor Santos.

2. Try to sleep more and more peacefully.

Do you get 8 hours of sleep every night?

This seems to be the easiest thing to do but in fact it is very difficult to do, he said.

The challenge here is to get eight hours of sleep every night. And this has to be done for a week.

"We all know that the more you sleep and the more you sleep, the less likely you are to suffer from depression. This also creates a positive attitude," said Professor Santos.

3. Meditate

Your job will be to meditate for 10 minutes every day.

Professor Santos said that when he was a student, he meditated regularly and saw that it made him feel better.

Now he is a professor, now he is teaching his students how to meditate. He said that full attention should be given to such work which can help people to be happy.

4. Spend more time with family and friends

Professor Santos says research has shown that you can be happy if you have a good time with family and friends.

They feel significantly better if you have good friendships and social contacts and direct communication between them.

It's not that you have to do too much, Santos said, "Just make sure you're alive at the moment, think you're spending the present time together and be a little aware of how you're spending your time."

Spending time with friends keeps the mind cheerful, says research.

“Your idea of ​​time is very important for you to be happy,” he said.

"We often calculate our wealth by how much money we have. But research has shown that wealth is actually related to how much time we have," he said.

5. Increase this communication in practice instead of communicating on social media

Professor Santos thinks that the false notion of happiness on social media should not be dispelled.

Stay away from social media to be happy, says Professor Santos

“The latest research has shown that people who use social media like Instagram are less happy than those who don’t use it too much,” he said.

So, now everything is known.

If you really want to be happy in life, start being grateful, spend more time with family, hang out with friends, meditate for a while at a time of the day, get away from everything, get away from social media and try to sleep a little more. Please.

If this works for Yale students, these tips will work for you too.