They who dream by day are cognizant of many things which escape those who dream only by night.

Those who dream by day are cognizant of many things that escape those who dream only at night.

Those who dream by day are cognizant of many things which escape those who dream only by night.

...the traveler, travelling through it,
May not-dare not openly view it;
Never its mysteries are exposed
To the weak human eye unclosed;
So wills its King, who hath forbid
The uplifting of the fringed lid;
And thus the sad Soul that here passes
Beholds it but through darkened glasses.

Of puns it has been said that those who most dislike them are those who are least able to utter them.

All that we see or seem is but a dream within a dream.