"peak happiness" is a correct and usable phrase in written English.
You can use it to describe the highest level of happiness one can experience. For example: "After winning the award, the actor felt a moment of peak happiness."
Studies show that although a peak of happiness occurs at the time of a lottery win, a few months later winners' happiness levels return to where they were before the prize.
And that phase, of course, is the other peak of happiness, the big one in our early 20s, just before the fall.
The research also found that people are much happier on weekends; the peak of happiness on Twitter is reached on Sunday mornings.
Wildlife thrives on what we perceive as a mess: weeds are great for pollinators, long grass is best for beetles, and un-dug soil is at its peak of happiness for the soil food web.
The 150 volunteers' reactions suggested there were two peaks of happiness during God Save The Queen, the first just after the drum roll that heralds its start, and the second at the lyrics "send her victorious".
It could be at the peak of their happiness or the peak of their despair.
Researchers say their findings do show some evidence of the u-shaped curve theory, which says happiness peaks as a young adult, hits a low point in middle age, and then climbs back up again as we enter our golden years. .
In fact, self-reported marital happiness peaks for women whose first marriage was in their early to mid-20's.
A wealth of scientific and anecdotal evidence demonstrates precisely that it's when people have surpassed many of life's big landmarks that their overall satisfaction and happiness peaks.
"Any environment where people are provided a realistic challenge and an opportunity to solve it, their interest levels usually peak, and so does overall happiness".
