The human body has types of nervous system responses. One is called the 'Sympathetic' and the other 'Parasympathetic'. The 'Sympathetic' response is to do with fight or flight - any time you need to breathe hard, often while exercising.
It's catabolic in nature, it uses up energy and resources to execute, and your body is agitated in order to create a useful result like that. On the flip slide, the Parasympathetic response is to do with healing, rest, relaxation and digestion.
It's the type of nervous system required to unwind, to rest at night and to recover from exercise.
The thing is, when you breathe too often, you're putting yourself into more of a Sympathetic nervous system response. Meaning, you're not allowing your body to rest, recover and digest.
In the modern world, with all the excitory stimuli we have around us, often we're breathing too much. It's affecting our adrenal system, and stopping us from resting effectively.
One thing you can practice is the 5 in and 5 out breathing method. Breathe in for 5 seconds, breathe out for 5 seconds. This will reduce the amount of breaths you take per minute, ensuring you're more in a parasympathetic mode.
If you're not exercising you should be in relaxation and building mode for nearly all of the time you're awake. E.g. Lets say you work out for 1 hour per day. You should spend the rest of the 23 hours in Parasympathetic mode, to maximise rest, recovery and anabolism.
In the 1920's the breathing rate was 5-7 breaths per minute. In todays age it's something like 10-13 breaths per minute.
Try this out, see how you feel. It could well improve your stress levels, help you build more muscle, digest food better and improve your general wellbeing.