The human brain can only focus on a few tasks and things at once.
This will usually be the most important things at a given time.
Our attentional space can focus on up to 4 things however, not all will have the same amount of attention.
The most important task will take up most of the brain's resources, while the remaining 3 tasks will have to make due with what is left.
With more and more information around us we are forced to make a lot more decisions than before.
Because of our brain's limited attentional space we need to ensure we remove all unnecessary distractions in order for us to truly focus on what matters.
This will also help the decision making progress. The more noise we can eliminate the more we can improve the decision making process.
If you are busy with a big task and something else enters your attentional space, for e.g. an email or text message, decide then and there about whether you want to deal with it or not.
If it's something that is going to be quick, for example, only a few seconds then take care of it immediately. (If it's something that's going to keep interrupting you then rather leave it and deal with it later) However, if it is something that is going to take longer than 5 min, then rather write it down and deal with it later.
For the tasks that are going to take you longer than 5 min. to accomplish, write it down or add it to your to-do list which you can come back later.
An organised life helps organise your mind. Keep your home screen neat and tidy and ensure your desk is always in order.
You can help organise your mind by finding dedicated destinations for your objects. Example, your keys, pens, etc.
The human brain can only dedicate 100% focus to a task for about 7 to 10 mins at a time. After that your focus levels drop significantly every 5 to 10 mins.
It's advised to take an active 5 to 10 min break to recharge your brain's battery's.
Sleep is obviously essential and it's advised aim for a min. of 6 to 7 hours of sleep. Some people might need more.