1. Total time spent awake soared or rocketed or jumped or increased just prior to 1970.
2. There was a sharp or dramatic or rapid rise or jump or increase or surge in the number of hours spent awake in the final two years of the 1960s.
3. The average number of waking hours per person (rose or increased or steadily) (slightly or gradually or increased) between 1980 and 1990.
4. It is predicted that the daily number of hours that each person spends awake will (continue or increase or significantly) to (increase or rise or steadily) in the future.