Hi Temo642 and thanks for posting this question and thanks everyone for weighing in!!
As someone responded here it may be a problem with dehydration so I would suggest to drink plenty of fluids.
On a side note try to increase your stretching activities since sometimes if a muscle is tight and sore it may cramped up. In other words and in a very simple way: if the muscle is really tight the nerves crossing those muscles tend to still have to go through the muscle and sometimes feels like a needle. It can be a build up of lactic acid.
Increase stretching, stay hydrated and careful of training hard. You always need to increae progressive muscle condition and strenght if you practice a sport.
If the symptoms persist please consult with your doctor asap.
thanks!
Try and have enough rest, thus sleep as early as u can
Agree with strongus. Rest as much as you can eat plenty of green leaf vegetables and stay hydrated.