You have several options. Sony has been the leader in downsizing cameras with great quality, but there are other options as well.
First, you mentioned "between dslr and pocket" --- There is the realm of mirrorless cameras. That's a VERY broad statement. They are interchangeable lens cameras, like dslrs, but are typically (not always) smaller due to the lack of an Optical viewfinder system, and sometimes smaller sensors.
Among mirrorless, you have the Sony A7 series -- These are full frame top of the line cameras. They are only slightly smaller than dSLRs, but they are likely far superior to your Nikon dSLR (I will assume you have an APS-C dSLR like most consumers).
More realistically for you, Sony, along with Fuji and Samsung, make APS-C mirrorless. This is the same type of sensor as your dSLR. Being newer than your dSLR, the image quality is likely noticeably superior to your dSLR. These cameras tend to be significantly smaller than most dSLRs. I just got the Sony A6000 as my backup camera (I use a full frame dSLR for my main camera). There is almost no downside to a camera like the A6000. The image quality will be equal or superior to your current dSLR. It will focus faster in most situations, the camera will be much faster in most situations. It will be much smaller. Far better live view, far better video. The few "downsides" --- It has an EVF instead of OVF. For many people, this is actually an advantage of mirrorless. But some people, sometimes for sentimental reasons, prefer an optical viewfinder. When shooting fast action, an OVF can sometimes be better. But the A6000 shoots 11 fps, and your older Nikon dSLR only likely shoots around 4 or 5 frames per second. So even for action, an EVF at 11 fps would generally be better than an OVF at 4-5 fps if you are trying to capture an action shot. To me, the biggest downside of EVF, is battery drain. You will find mirrorless batteries run out much faster than dSLR batteries. The other downside can be lens selection -- But this is a non-issue for most consumers. You said you have 2 lenses --- You can get lenses just as good for a system like the Sony mirrorless. The lens selection issue starts to come into play when you are looking at specialized $3000 lenses. You can get regular zoom lenses, some fast prime lenses, for a system like the Sony. But if you are shooting with a 17-50/2.8 on your dSLR, there is no full equivalent for a Sony mirrorless. On the other hand, you may find equivalents in Fuji or Samsung.
Next in the mirrorless world, you have Olympus and Panasonic 4:3 systems. They use a sensor a bit smaller than APS-C. It makes the cameras and lenses a little smaller than the Sony/Fuji/Samsung mirrorless. They have a great lens selection, a bit better than Sony. But as the sensor is smaller, the image quality is a little behind. Not a massive step behind, but a slight step backwards.
Next, you have the Nikon 1 system. This is a very compact system, known for super-fast autofocus. But the sensor is significantly smaller. The lenses aren't great. So it is a noticeable step backwards in image quality. It's still better than most point and shoots. But far behind a dSLR.
Then moving out of interchangeable lens cameras, you have a newer breed of enthusiast compacts. Many use a sensor developed by Sony that they call their "1 inch" sensor. It is the same size as the Nikon 1 sensor, but performs a little bit better. And many of these compacts have better lenses. So overall, they perform slightly better than the Nikon 1. These cameras can be capable of taking dark ride pics. The image quality *can* match some dSLRs. Especially, if you are comparing a camera like the Sony RX100 compared to an older dSLR with a kit lens --- Between the fact that the Sony RX100 has a newer sensor, combined with the fact that the Sony lens is better than a kit dSLR lens, the Sony RX100 can match or surpass the dSLR in many situations. But a camera like the RX100 cannot match a new dSLR with a premium lens attached.
The enthusiast cameras being made with the 1 inch sensor are:
The Sony RX100 (they now have 4 models for sale, from oldest to newest), the Sony RX10 (same sensor, slightly bigger camera, longer lens with more zoom range and better video), the Panasonic FZ1000 (similar to the RX10, the lens is a bit longer), and a few Canon GX models.
Here are Disney photos taken with the original version of the Sony RX100:
https://flic.kr/s/aHsjBS3cEA
https://www.flickr.com/gp/havoc315/x58f01