I hae gude experience of these matters.
The first night is aye the warst o't.

I hae never heard o' ane that sleepit the night afore trial, but of mony a ane that sleepit as sound as a tap the night before their necks were straughted.

And it's nae wonder--the warst may be tholed when it's kend--Better a finger aff as aye wagging.".