Don't feel like using my brain

Today I am back at work after training. And I have an 8.30am meeting at the client and another meeting with the client on Friday to prepare for, as well as try an scope an assignment which is rather technical in nature and a bit different to other assignments I've done. And I just don't feel like using my brain to work it all out!!! But I guess I get paid to use my brain so I have to do it. Maybe after this mornings meeting and a cappuchino I will feel more up to the challenge!! What is life without challenges?!