I think in a way it depends on what you mean by too much.

Do you find you have too many time consuming commitments going on which make it difficult for you to fit training in without feeling you are sacrificing or failing at another commitment?

If so I would go and take a break to do whatever you have to do to catch up and come back to it. The sooner the better so you have less to catch up on. The problem with leaving it is the longer you do the further behind you end up.

Also you'll feel like you begin to resent any training sessions which didn't seem to achieve much and rather than feeling your training is a welcome stress reliever it will feel like a waste of time. Obviously this is bad because it's a rare coach who is good enough to make you feel like every session achieved something especially if you're lacking sleep and not recovering from your sessions properly.

Apart from that i'd think about how you feel about the training atmosphere. Can you make it or do you enjoy it enough for it to be a stress reliever in itself? Can you use it to help you cope?