The pall of sickness was finally beginning to lift from our journey . I had had another lousy night of sleep - for some reason I 'd been awake for more than half the night with my mind racing , full of pointless thoughts about employment , friendships and other odds and ends . But when I did sleep , and then wake in the morning , I could n't claim to feel any worse than " a bit average " , and a cocktail of pseudoephedrine and paracetamol put paid to that .

Based on the preceding passage, choose your answer for question Why is the narrator so groggy ?
Available choices: (a). They did n't sleep last night .; (b). They have a lot of activities going on .; (c). They took medicine to get to sleep .; (d). None of the above choices .;
The answer is:
(c).