It's pretty clear you want to see how you get on sleeping outside without kit, taking it right back to the bare minimum - to test yourself? Maybe to 're-boot' and take stock of what's really needed and what's just excess guff? Everyone feels differently about what's essential, kit wise. You have a knife in your kit but have never really had cause to use it. Perhaps this is because you've carried the kit that would otherwise need to be sourced from the wild, or headed home/to the pub before needing to improvise a bed, light a fire to keep warm etc. You'll only really know what's essential if you try it.
But...you would have to be crazy (or have no other choice) to do this without being prepared to get yourself out of a pickle should a pickle occur.
Why not try it as a controlled experiment (have a sleeping bag, stove, metal pot, water and food in a bag within reach - let someone else know what you're up to). You'll soon know what's possible and what amounts to fanciful romantics.
Having spent many a night outdoors with and without kit at all times of the year, I know that I could muddle on through until the morning but depending on the weather and my condition, this wouldn't be a pleasurable or particularly restful experience. From experience I also know that with the addition of the right clothing, a small cutting tool and a metal pot my situation can be improved dramatically (assuming you have the knowledge to use these essential items effectively). In the right location and with enough time set aside I could be comfortable by nightfall so these three essential bits of kit would be my bare minimum (proper clothing, cutting tool, metal pot) as all three are extremely difficult to improvise from the wild. Possible, but difficult, location dependant and time consuming. The addition of a fire steel, large heavy gauge transparent plastic bag and a staple carbohydrate ration would improve my situation immeasurably, speeding up my preparation time before nightfall and decreasing my workload. These items could all fit in the metal pot. For safety I would take a pocket first aid kit (concentrating on stopping bleeding mainly - a sensible precaution if using sharp tools when tired and hungry), a small torch and a reliable method of communication to contact help if needed. So...we're talking mainly pocketable items, a weatherproof and warm set of clothing and a small cooking pot. That seems like a safer and more sensible adventure than just curling up in a hedge.
Would love to hear how you get on
Cheers
Joe