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The BTS covered walkways close around +/- 1 hour around midnight. I can't remember the exact time.
For hotels and amenities, sometimes your home country can give you an advantage. In North America, many of our hotel credit cards give us loyalty status upgrades as part of holding the card. I get Marriott Platinum status from one (free lounges), Hilton Gold from another (there is one card out there I don't have with diamond/lounge access), and a third with IHG Platinum. I will be using my Marriott Platinum perks at the Sheraton Grande Sukhumvit in May.
All those cards have annual fees. But if travel, they will pay for themselves very quickly.

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With my frequent visits to Thailand to see the temples and eat street food (*cough*) it has made sense for me to sign up to the Accor+ program as it more than pays for itself. One of the main benefits is the free nights offer and I used this recently to stay at the Sofitel. I usually stay in mid-level hotels like the Mercure on Soi 11 and the Holiday Inn Express in Pattaya but often like a nicer hotel to finish my trip when the rates are good in the off-season. My usual go-to is the Hyatt Regency which I very much like, and this was my first time at the Sofitel where I spent 4-nights. I booked a 'luxury' room with club access so I could compare it to the Hyatt, but I was upgraded to a junior suite which makes it an unfair to compare rooms. What I will say is that the size of the bed, its comfort and the quality of the bedding is on par with the Hyatt. The bathroom amenities are similar as is the quality and responsiveness of the cleaning services. The main difference was the rooftop bar area, lounge, gym, and overall quality of service. Spectrum at the Hyatt is a more 'showy' place, it's got spectacular views and its where tourist like to visit for the skyline and the vibe. Belga at the Sofitel is really an outside terrace and lower key with a discreet service sort of vibe. I've taken LB guests to both and they enjoyed it and the staff treated them with respect. Also, you can get a 30% discount on food and drink at Sofitel with Accor+ which is a good benefit. I have been given a couple of free drink vouchers at the Hyatt but not always. The lounge at the Hyatt is small and can get busy, but the lounge at the Sofitel is one can get lost in and takes up an entire floor, but most people congregate near the food area. Food and drink offerings are broadly on par, maybe the wine is better at the Sofitel The gym at both hotels are good, but the Sofitel is far better for my needs. Unfortunately the pool at the Sofitel was closed for refurbishment so can't compare those. Service standards are very good at both hotels, but I would put Sofitel ahead here. Its just that bit more attentive and personalised. You can also walk direct from Nana BTS to the Hyatt under the covered skywalk, and from Asok to the Sofitel using the footbridge but the Sofitel access is covered all the way so you won't get caught out if its raining (although not sure if that access is 24/7). I will still be using Hyatt as part of my points collection strategy and to maintain my current status but the main driver when deciding between either will be the cost, including club access. Hyatt is usually cheaper but using Accor+ benefits and reward points can balance this out.  Overall, both are very good hotels that you can spend all day in especially if you have lounge access, and of course its very guest friendly! It's a case of give each one a try and see which one gives you the best value. Either way I don't think you will go to far wrong if you want a better standard of accommodation near the action.

There simply isn't on general rule of thumb. I always arrive between 9.30 and 10 30 am. Queue time before immigrations varied from absolutely none to >90 minutes  Too much dependencies to predict! 

I have always assumed that was true, but I arrived at noon last January and had a 50 minute wait in the immigration line.

The best Swampy advice is not to arrive at midnight for the EU rush hours. The lines can be horrible. After lunch is much calmer.