Andrew Weil said this quote

The notion that a human being should be constantly happy is a uniquely modern, uniquely American, uniquely destructive idea.

~ Andrew Weil

I think instead [of happiness] we should be working for contentment... an inner sense of fulfillment that's relatively independent of external circumstances.

~ Andrew Weil

Among other things, neuroplasticity means that emotions such as happiness and compassion can be cultivated in much the same way that a person can learn through repetition to play golf and basketball or master a musical instrument, and that such practice changes the activity and physical aspects of specific brain areas.

~ Andrew Weil

People who are contented and serene sleep well. They fall asleep easily, stay asleep, and wake refreshed. Conversely, people who are anxious, stressed, or depressed do not sleep well, and chronic insomnia is strongly associated with mood disorders. These are clear correlations, but what is cause and what is effect is not clear. Most experts agree that sleep and mood are closely related, that healthy sleep can enhance emotional well-being, while insufficient quantity or quality of sleep can adversely affect it.

~ Andrew Weil