1.   Her thoughts drifted to when she herself had been seventeen.

2.   Her thoughts drifted, but she was not asleep.

3.   His thoughts drifted back to the Connons.

4.   His thoughts drifted forward in time from his Novitiate.

5.   My thoughts drifted back to the time when we first met.

6.   Her thoughts drifted back to Spike, the metal man, who had been killed less than an hour ago.

7.   But the daggers had remained sheathed during the meal, and she had allowed her thoughts to drift into those glittering waters.

8.   Usually she managed to keep the looming black cloud of misery at bay, but there were times when her thoughts would drift away and her eyes would mist.