Worth a go
You should check out the 'bargain berths' section on the relevant website (I can never remember the address, but google for caledonian sleeper and it should show up) for good value fares.
The most popular/scenic route is to or from Fort William, especially in the summer due to the long bright evenings and the long stretch of track trough the highlands, but other routes are worth a go.
I did London-Aberdeen last Summer pretty cheaply. Flew to London on a mid-day (i.e. off peak €1) flight, floated around Euston area for a while, had dinner, got the train up (£19), checked out Aberdeen for the day, B&B overnight and then a Ryanair £0.01 flight home from Aberdeen.
I was looking at Fort William this summer. It's normally sold out (i.e. no bargain fares) but last time I checked there was a Friday evening departure to London for £19 available in August. Unfortunately there was only one ticket, so that didn't suit, but otherwise it would have been similar - fly to Glasgow/Prestwick/Edinburgh, train to Fort William, sleeper back down, cheap over night in London and a flight home on Sunday.
You can also get the sleeper to Penzance in Cornwall, but because the distance is much shorter you leave London around midnight and still get there about 0700 or something, so the experience is not the same.
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