The following six sentences come from a paragraph. The first and the last sentences are given. Choose the order in which the four sentences (PQRS) should appear to complete the paragraph.
S1 : People have always been fascinated by dreams.
S6 : But a small number, perhaps less than 5% have them regularly.
P : In fact, only recently have there been serious studies to find out how many of us actually have nightmares.
Q : Now that is changing.
R : But the study of nightmares has been curiously neglected.
S : While results so far are inconclusive, it seems fair to say that at least half the population has occasional nightmares.
The proper sequence should be: