Lately I've been feeling really tired. I think I was stressing over my exams, so as a result I wasn't sleeping as well as usual :( . I've found that this tip has really helped me! It sounds a bit crazy but it actually really helps. In the morning if I'm feeling a bit tired I fill the bath room sink with cold water then... wait for it... I submerge my face in it! This really helps to waken up myself as well as my face and its really refreshing!