Hello Peter Riemens,
Apple Support Communities is a wonderful place for help with your MacBook Pro. From the description, it sounds as though you’re noticing abnormal temperatures and fan noise when first waking your Mac in the morning.
We're glad to know that turning off and on Bluetooth helps provide a resolution. In addition to those steps, we recommend the steps outlined in the section Check for unexpected heavy fan use of the following article.
About fans and fan noise in your Apple product
If you continue to have issues after completing those steps, you will want to check for any processes that may be using a large percentage of the CPU. You can find the steps for reviewing the processes in the article below.
View CPU activity in Activity Monitor on mac
After viewing what processes are using an abnormal amount of the CPU, you may find the steps to quit an app or process helpful in reaching a resolution. Those steps are outlined in the following article.
Quit an app or process in Activity Monitor on Mac
We hope you have a great rest of your week!