AC 3696 - "laying down" and "sleeping" signify tranquillity

AC 3696
With those who are to be regenerated...
the case is that first of all they are in a state of tranquillity,
or in a state of external peace
(for external peace, or peace in externals, is called "tranquillity")
and the same is produced from the Divine state of peace
that is inmostly within it;
and it comes forth into the externals through the removal
of cupidities (evil desires) and falsities (false ideas);
for these are what cause all unrest.

[2]
... a state of peace in spiritual things
is like spring and dawn in natural things...
and that peace is from good and truth,
and unrest from what is evil and false....

In peace I will both lay me down and sleep;
for You Jehovah alone makes me to dwell in confidence.
(Psalm 4:8)

He will make me to lie down in green pastures;
He will lead me to the waters of rest;
He will restore my soul.
(Psalm 23:2,3)